diff --git a/pkg/_fe_analyzer_shared/lib/src/experiments/flags.dart b/pkg/_fe_analyzer_shared/lib/src/experiments/flags.dart
index 8c4c79d2490..1234f031924 100644
--- a/pkg/_fe_analyzer_shared/lib/src/experiments/flags.dart
+++ b/pkg/_fe_analyzer_shared/lib/src/experiments/flags.dart
@@ -109,7 +109,7 @@ enum ExperimentalFlag {
   getterSetterError(
     name: 'getter-setter-error',
     isEnabledByDefault: true,
-    isExpired: false,
+    isExpired: true,
     experimentEnabledVersion: const Version(3, 9),
     experimentReleasedVersion: const Version(3, 9),
   ),
@@ -181,7 +181,7 @@ enum ExperimentalFlag {
   nativeAssets(
     name: 'native-assets',
     isEnabledByDefault: true,
-    isExpired: false,
+    isExpired: true,
     experimentEnabledVersion: const Version(3, 9),
     experimentReleasedVersion: const Version(3, 9),
   ),
@@ -205,7 +205,7 @@ enum ExperimentalFlag {
   nullAwareElements(
     name: 'null-aware-elements',
     isEnabledByDefault: true,
-    isExpired: false,
+    isExpired: true,
     experimentEnabledVersion: const Version(3, 8),
     experimentReleasedVersion: const Version(3, 8),
   ),
@@ -253,7 +253,7 @@ enum ExperimentalFlag {
   soundFlowAnalysis(
     name: 'sound-flow-analysis',
     isEnabledByDefault: true,
-    isExpired: false,
+    isExpired: true,
     experimentEnabledVersion: const Version(3, 9),
     experimentReleasedVersion: const Version(3, 9),
   ),
diff --git a/pkg/analyzer/lib/src/dart/analysis/experiments.g.dart b/pkg/analyzer/lib/src/dart/analysis/experiments.g.dart
index b36b6b57570..7a1b07d219c 100644
--- a/pkg/analyzer/lib/src/dart/analysis/experiments.g.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/experiments.g.dart
@@ -785,7 +785,7 @@ class IsExpired {
   static const bool generic_metadata = true;
 
   /// Expiration status of the experiment "getter-setter-error"
-  static const bool getter_setter_error = false;
+  static const bool getter_setter_error = true;
 
   /// Expiration status of the experiment "inference-update-1"
   static const bool inference_update_1 = true;
@@ -812,7 +812,7 @@ class IsExpired {
   static const bool named_arguments_anywhere = true;
 
   /// Expiration status of the experiment "native-assets"
-  static const bool native_assets = false;
+  static const bool native_assets = true;
 
   /// Expiration status of the experiment "non-nullable"
   static const bool non_nullable = true;
@@ -821,7 +821,7 @@ class IsExpired {
   static const bool nonfunction_type_aliases = true;
 
   /// Expiration status of the experiment "null-aware-elements"
-  static const bool null_aware_elements = false;
+  static const bool null_aware_elements = true;
 
   /// Expiration status of the experiment "patterns"
   static const bool patterns = true;
@@ -839,7 +839,7 @@ class IsExpired {
   static const bool set_literals = true;
 
   /// Expiration status of the experiment "sound-flow-analysis"
-  static const bool sound_flow_analysis = false;
+  static const bool sound_flow_analysis = true;
 
   /// Expiration status of the experiment "spread-collections"
   static const bool spread_collections = true;
diff --git a/pkg/dartdev/test/experiments_test.dart b/pkg/dartdev/test/experiments_test.dart
index 681eafe5e77..a5bc8e433e6 100644
--- a/pkg/dartdev/test/experiments_test.dart
+++ b/pkg/dartdev/test/experiments_test.dart
@@ -3,9 +3,12 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:dartdev/src/experiments.dart';
-import 'package:dartdev/src/sdk.dart';
 import 'package:test/test.dart';
 
+// ONLY use dedicated test experiments in this test.
+// Any other experiment will eventually be retired, and then a test depending
+// on it will fail.
+
 void main() {
   group('experiments', () {
     test('experimentalFeatures', () {
@@ -20,24 +23,5 @@ void main() {
       final errors = validateExperiments(['foo']);
       expect(errors, equals(['Unknown experiment: foo']));
     });
-
-    test('native assets experiment', () {
-      final errors = validateExperiments(['native-assets']);
-      final channel = Runtime.runtime.channel!;
-      switch (channel) {
-        case 'stable':
-        case 'beta':
-          expect(
-            errors,
-            equals([
-              'Unavailable experiment: native-assets (this experiment is only '
-                  'available on the main, dev channels, this current channel is $channel)',
-            ]),
-          );
-
-        default:
-          expect(errors, isEmpty);
-      }
-    });
   });
 }
diff --git a/pkg/front_end/lib/src/api_prototype/experimental_flags_generated.dart b/pkg/front_end/lib/src/api_prototype/experimental_flags_generated.dart
index a0ffa860087..dcab24caacb 100644
--- a/pkg/front_end/lib/src/api_prototype/experimental_flags_generated.dart
+++ b/pkg/front_end/lib/src/api_prototype/experimental_flags_generated.dart
@@ -173,7 +173,7 @@ class ExperimentalFlag {
   static const ExperimentalFlag getterSetterError = const ExperimentalFlag(
     name: 'getter-setter-error',
     isEnabledByDefault: true,
-    isExpired: false,
+    isExpired: true,
     enabledVersion: const Version(3, 9),
     experimentEnabledVersion: const Version(3, 9),
     experimentReleasedVersion: const Version(3, 9),
@@ -254,7 +254,7 @@ class ExperimentalFlag {
   static const ExperimentalFlag nativeAssets = const ExperimentalFlag(
     name: 'native-assets',
     isEnabledByDefault: true,
-    isExpired: false,
+    isExpired: true,
     enabledVersion: const Version(3, 9),
     experimentEnabledVersion: const Version(3, 9),
     experimentReleasedVersion: const Version(3, 9),
@@ -281,7 +281,7 @@ class ExperimentalFlag {
   static const ExperimentalFlag nullAwareElements = const ExperimentalFlag(
     name: 'null-aware-elements',
     isEnabledByDefault: true,
-    isExpired: false,
+    isExpired: true,
     enabledVersion: const Version(3, 8),
     experimentEnabledVersion: const Version(3, 8),
     experimentReleasedVersion: const Version(3, 8),
@@ -335,7 +335,7 @@ class ExperimentalFlag {
   static const ExperimentalFlag soundFlowAnalysis = const ExperimentalFlag(
     name: 'sound-flow-analysis',
     isEnabledByDefault: true,
-    isExpired: false,
+    isExpired: true,
     enabledVersion: const Version(3, 9),
     experimentEnabledVersion: const Version(3, 9),
     experimentReleasedVersion: const Version(3, 9),
diff --git a/pkg/front_end/testcases/getter_setter_error/folder.options b/pkg/front_end/testcases/getter_setter_error/folder.options
index e383bfb6ee3..e69de29bb2d 100644
--- a/pkg/front_end/testcases/getter_setter_error/folder.options
+++ b/pkg/front_end/testcases/getter_setter_error/folder.options
@@ -1 +0,0 @@
---enable-experiment=getter-setter-error
diff --git a/pkg/front_end/testcases/textual_outline.status b/pkg/front_end/testcases/textual_outline.status
index 6dd1f1f3ca0..0bf63a944bf 100644
--- a/pkg/front_end/testcases/textual_outline.status
+++ b/pkg/front_end/testcases/textual_outline.status
@@ -63,8 +63,3 @@ regress/issue_34850: UnknownChunk # Test has parser errors
 coverage/external_test: FormatterCrash
 coverage/operator_unsupported_test: EmptyOutput
 coverage/syntax_get_set_syntax_test: UnknownChunk
-
-null_aware_elements/constant_collections: FormatterCrash
-null_aware_elements/constant_null_aware_map_entry_shorting: FormatterCrash
-null_aware_elements/constant_null_aware_map_entry_shorting_erroneous: FormatterCrash
-null_aware_elements/simple_positive: FormatterCrash
diff --git a/tests/language/null_aware_elements/const_literals_error_test.dart b/tests/language/null_aware_elements/const_literals_error_test.dart
index 694b93868a0..8b32819d3eb 100644
--- a/tests/language/null_aware_elements/const_literals_error_test.dart
+++ b/tests/language/null_aware_elements/const_literals_error_test.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// SharedOptions=--enable-experiment=null-aware-elements
-
 import 'package:expect/expect.dart';
 
 const nullConst = null;
diff --git a/tests/language/null_aware_elements/const_literals_test.dart b/tests/language/null_aware_elements/const_literals_test.dart
index a148b4b6fbf..ba7597b7b28 100644
--- a/tests/language/null_aware_elements/const_literals_test.dart
+++ b/tests/language/null_aware_elements/const_literals_test.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// SharedOptions=--enable-experiment=null-aware-elements
-
 import 'package:expect/expect.dart';
 
 const nullConst = null;
diff --git a/tests/language/null_aware_elements/evaluation_order_test.dart b/tests/language/null_aware_elements/evaluation_order_test.dart
index ade8b0eec06..6a7a5f59a07 100644
--- a/tests/language/null_aware_elements/evaluation_order_test.dart
+++ b/tests/language/null_aware_elements/evaluation_order_test.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// SharedOptions=--enable-experiment=null-aware-elements
-
 import 'package:expect/expect.dart';
 
 String log = "";
diff --git a/tests/language/null_aware_elements/flow_analysis_test.dart b/tests/language/null_aware_elements/flow_analysis_test.dart
index 5fca9775e64..98e8d61fdcd 100644
--- a/tests/language/null_aware_elements/flow_analysis_test.dart
+++ b/tests/language/null_aware_elements/flow_analysis_test.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// SharedOptions=--enable-experiment=null-aware-elements
-
 import '../static_type_helper.dart';
 
 test1(String a, num x) {
diff --git a/tests/language/null_aware_elements/type_inference_maps_test.dart b/tests/language/null_aware_elements/type_inference_maps_test.dart
index b648a1b70f3..9a9ce860867 100644
--- a/tests/language/null_aware_elements/type_inference_maps_test.dart
+++ b/tests/language/null_aware_elements/type_inference_maps_test.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// SharedOptions=--enable-experiment=null-aware-elements
-
 import '../static_type_helper.dart';
 
 test(String? key, num? value) {
diff --git a/tests/language/null_aware_elements/type_inference_simple_error_test.dart b/tests/language/null_aware_elements/type_inference_simple_error_test.dart
index 4508247b46f..0a5912eab08 100644
--- a/tests/language/null_aware_elements/type_inference_simple_error_test.dart
+++ b/tests/language/null_aware_elements/type_inference_simple_error_test.dart
@@ -2,13 +2,11 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// SharedOptions=--enable-experiment=null-aware-elements
-
 import '../static_type_helper.dart';
 
 String? stringQuestion() => null;
 
-main() {
+void main() {
   <String>[?""]; // Ok.
   //       ^
   // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
diff --git a/tests/language/null_aware_elements/type_inference_simple_positive_test.dart b/tests/language/null_aware_elements/type_inference_simple_positive_test.dart
index 795b6991d24..e9bf5b1e39f 100644
--- a/tests/language/null_aware_elements/type_inference_simple_positive_test.dart
+++ b/tests/language/null_aware_elements/type_inference_simple_positive_test.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// SharedOptions=--enable-experiment=null-aware-elements
-
 import '../static_type_helper.dart';
 
 // This is a helper function to suggest to the type inference that the argument
diff --git a/tests/language/null_aware_elements/warnings_simple_test.dart b/tests/language/null_aware_elements/warnings_simple_test.dart
index 5b4087ceeed..45427264ad7 100644
--- a/tests/language/null_aware_elements/warnings_simple_test.dart
+++ b/tests/language/null_aware_elements/warnings_simple_test.dart
@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// SharedOptions=--enable-experiment=null-aware-elements
-
 import 'package:expect/expect.dart';
 
 List<int> testList(int x) {
diff --git a/tests/language/sound_flow_analysis/equality_comparisons_test.dart b/tests/language/sound_flow_analysis/equality_comparisons_test.dart
index 3734dc5fbde..79d61473601 100644
--- a/tests/language/sound_flow_analysis/equality_comparisons_test.dart
+++ b/tests/language/sound_flow_analysis/equality_comparisons_test.dart
@@ -5,8 +5,6 @@
 // Exercises flow analysis of equality comparisons (binary expressions using
 // `==` or `!=`) when `sound-flow-analysis` is enabled.
 
-// SharedOptions=--enable-experiment=sound-flow-analysis
-
 import '../static_type_helper.dart';
 
 // `<nonNullable> == <Null>` is known to evaluate to `false`.
diff --git a/tests/language/sound_flow_analysis/full_demotion_test.dart b/tests/language/sound_flow_analysis/full_demotion_test.dart
index a2e23e1791a..137c5cc42ee 100644
--- a/tests/language/sound_flow_analysis/full_demotion_test.dart
+++ b/tests/language/sound_flow_analysis/full_demotion_test.dart
@@ -5,8 +5,6 @@
 // Exercises flow analysis of assignments that fully demote the assigned
 // variable when `sound-flow-analysis` is enabled.
 
-// SharedOptions=--enable-experiment=sound-flow-analysis
-
 import '../static_type_helper.dart';
 
 // If an assignment fully demotes a variable, types of interest are not cleared.
diff --git a/tests/language/sound_flow_analysis/if_null_test.dart b/tests/language/sound_flow_analysis/if_null_test.dart
index 15340552db1..aac9fc77592 100644
--- a/tests/language/sound_flow_analysis/if_null_test.dart
+++ b/tests/language/sound_flow_analysis/if_null_test.dart
@@ -5,8 +5,6 @@
 // Exercises flow analysis of if-null expressions (expressions involving `??`)
 // when `sound-flow-analysis` is enabled.
 
-// SharedOptions=--enable-experiment=sound-flow-analysis
-
 // ignore_for_file: dead_null_aware_expression
 
 import '../static_type_helper.dart';
diff --git a/tests/language/sound_flow_analysis/null_aware_access_test.dart b/tests/language/sound_flow_analysis/null_aware_access_test.dart
index 16778d80899..5cce87899dc 100644
--- a/tests/language/sound_flow_analysis/null_aware_access_test.dart
+++ b/tests/language/sound_flow_analysis/null_aware_access_test.dart
@@ -5,8 +5,6 @@
 // Exercises flow analysis of null aware accesses (expressions involving `?.`)
 // when `sound-flow-analysis` is enabled.
 
-// SharedOptions=--enable-experiment=sound-flow-analysis
-
 // ignore_for_file: invalid_null_aware_operator
 
 import '../static_type_helper.dart';
diff --git a/tests/language/sound_flow_analysis/null_aware_field_access_test.dart b/tests/language/sound_flow_analysis/null_aware_field_access_test.dart
index 81ea494d567..7a6c63c76a4 100644
--- a/tests/language/sound_flow_analysis/null_aware_field_access_test.dart
+++ b/tests/language/sound_flow_analysis/null_aware_field_access_test.dart
@@ -9,8 +9,6 @@
 // this test reflects the current behavior of the `sound-flow-analysis` feature,
 // as discussed in https://github.com/dart-lang/language/issues/4344.
 
-// SharedOptions=--enable-experiment=sound-flow-analysis
-
 // ignore_for_file: invalid_null_aware_operator
 
 import 'package:expect/static_type_helper.dart';
diff --git a/tests/language/sound_flow_analysis/null_aware_map_entry_test.dart b/tests/language/sound_flow_analysis/null_aware_map_entry_test.dart
index 349ce18f9b3..ab1a8619137 100644
--- a/tests/language/sound_flow_analysis/null_aware_map_entry_test.dart
+++ b/tests/language/sound_flow_analysis/null_aware_map_entry_test.dart
@@ -5,8 +5,6 @@
 // Exercises flow analysis of null-aware map entries when `sound-flow-analysis`
 // is enabled.
 
-// SharedOptions=--enable-experiment=sound-flow-analysis
-
 // ignore_for_file: invalid_null_aware_operator
 
 import '../static_type_helper.dart';
diff --git a/tests/language/sound_flow_analysis/pattern_matching_non_nullable_test.dart b/tests/language/sound_flow_analysis/pattern_matching_non_nullable_test.dart
index 937c526e12f..f5259c5eebe 100644
--- a/tests/language/sound_flow_analysis/pattern_matching_non_nullable_test.dart
+++ b/tests/language/sound_flow_analysis/pattern_matching_non_nullable_test.dart
@@ -5,8 +5,6 @@
 // Exercises flow analysis of patterns that match a non-nullable scrutinee when
 // `sound-flow-analysis` is enabled.
 
-// SharedOptions=--enable-experiment=sound-flow-analysis
-
 // ignore_for_file: unnecessary_null_check_pattern
 
 import '../static_type_helper.dart';
diff --git a/tests/language/sound_flow_analysis/pattern_matching_null_test.dart b/tests/language/sound_flow_analysis/pattern_matching_null_test.dart
index 1bb7eb9c791..2b9ca5917f7 100644
--- a/tests/language/sound_flow_analysis/pattern_matching_null_test.dart
+++ b/tests/language/sound_flow_analysis/pattern_matching_null_test.dart
@@ -5,8 +5,6 @@
 // Exercises flow analysis of patterns that match a Null scrutinee when
 // `sound-flow-analysis` is enabled.
 
-// SharedOptions=--enable-experiment=sound-flow-analysis
-
 import '../static_type_helper.dart';
 
 typedef IntQuestion = int?;
diff --git a/tests/language/sound_flow_analysis/pattern_not_matching_non_nullable_test.dart b/tests/language/sound_flow_analysis/pattern_not_matching_non_nullable_test.dart
index 730cd8524ae..616dd367f8c 100644
--- a/tests/language/sound_flow_analysis/pattern_not_matching_non_nullable_test.dart
+++ b/tests/language/sound_flow_analysis/pattern_not_matching_non_nullable_test.dart
@@ -5,8 +5,6 @@
 // Exercises flow analysis of patterns that fail to match a non-nullable
 // scrutinee when `sound-flow-analysis` is enabled.
 
-// SharedOptions=--enable-experiment=sound-flow-analysis
-
 import 'package:expect/expect.dart';
 
 import '../static_type_helper.dart';
diff --git a/tests/language/sound_flow_analysis/pattern_not_matching_null_test.dart b/tests/language/sound_flow_analysis/pattern_not_matching_null_test.dart
index 6d6a419df27..583eadc6d96 100644
--- a/tests/language/sound_flow_analysis/pattern_not_matching_null_test.dart
+++ b/tests/language/sound_flow_analysis/pattern_not_matching_null_test.dart
@@ -5,8 +5,6 @@
 // Exercises flow analysis of patterns that fail to match a Null scrutinee when
 // `sound-flow-analysis` is enabled.
 
-// SharedOptions=--enable-experiment=sound-flow-analysis
-
 import '../static_type_helper.dart';
 
 // `<nonNullable> <var>` is known to mismatch a null expression.
diff --git a/tests/language/sound_flow_analysis/proper_subtypes_test.dart b/tests/language/sound_flow_analysis/proper_subtypes_test.dart
index d2a80a09639..5b476a6adbb 100644
--- a/tests/language/sound_flow_analysis/proper_subtypes_test.dart
+++ b/tests/language/sound_flow_analysis/proper_subtypes_test.dart
@@ -5,8 +5,6 @@
 // Checks that when `sound-flow-analysis` is enabled, each type in a promotion
 // chain is a proper subtype of the previous type (and of the declared type).
 
-// SharedOptions=--enable-experiment=sound-flow-analysis
-
 import '../static_type_helper.dart';
 
 class C {
diff --git a/tests/language/sound_flow_analysis/trivially_satisfied_type_check_test.dart b/tests/language/sound_flow_analysis/trivially_satisfied_type_check_test.dart
index 768ee8dfd19..71238137d34 100644
--- a/tests/language/sound_flow_analysis/trivially_satisfied_type_check_test.dart
+++ b/tests/language/sound_flow_analysis/trivially_satisfied_type_check_test.dart
@@ -5,8 +5,6 @@
 // Exercises flow analysis of a trivially satisfied type check (an `is` test
 // that is guaranteed to succeed) when `sound-flow-analysis` is enabled.
 
-// SharedOptions=--enable-experiment=sound-flow-analysis
-
 import '../static_type_helper.dart';
 
 // If `x` is of type `T`, flow analysis considers `x is T` to be guaranteed to
diff --git a/tests/language/sound_flow_analysis/try_finally_layering_test.dart b/tests/language/sound_flow_analysis/try_finally_layering_test.dart
index 526fbb5ca4d..61b28635a90 100644
--- a/tests/language/sound_flow_analysis/try_finally_layering_test.dart
+++ b/tests/language/sound_flow_analysis/try_finally_layering_test.dart
@@ -5,8 +5,6 @@
 // Tests how flow analysis layers promotions from `try` and `finally` blocks
 // when `sound-flow-analysis` is enabled.
 
-// SharedOptions=--enable-experiment=sound-flow-analysis
-
 import '../static_type_helper.dart';
 
 class C {
diff --git a/tests/language/sound_flow_analysis/type_tests_test.dart b/tests/language/sound_flow_analysis/type_tests_test.dart
index 76d2240730a..aa4110d7ff0 100644
--- a/tests/language/sound_flow_analysis/type_tests_test.dart
+++ b/tests/language/sound_flow_analysis/type_tests_test.dart
@@ -5,8 +5,6 @@
 // Exercises flow analysis of type tests (`is` and `as` expressions) when
 // `sound-flow-analysis` is enabled.
 
-// SharedOptions=--enable-experiment=sound-flow-analysis
-
 import 'package:expect/expect.dart';
 
 import '../static_type_helper.dart';
diff --git a/tools/experimental_features.yaml b/tools/experimental_features.yaml
index 7ae13e1b728..2143bfb3ce3 100644
--- a/tools/experimental_features.yaml
+++ b/tools/experimental_features.yaml
@@ -135,11 +135,6 @@ features:
     experimentalReleaseVersion: '3.3.0'
     help: "Static meta-programming"
 
-  native-assets:
-    help: "Compile and bundle native assets."
-    channels: [ "main", "dev", "beta" ]
-    enabledIn: '3.9.0'
-
   record-use:
     help: "Output arguments used by static functions."
     channels: [ "main", "dev" ]
@@ -183,6 +178,11 @@ features:
       }
     help: "Shorter dot syntax for static accesses."
 
+  native-assets:
+    help: "Compile and bundle native assets."
+    channels: [ "main", "dev", "beta" ]
+    enabledIn: '3.9.0'
+    expired: true
 
   getter-setter-error:
     enabledIn: '3.9.0'
@@ -197,6 +197,7 @@ features:
         print(a.foo);
       }
     help: "Stop reporting errors about mismatching types in a getter/setter pair."
+    expired: true
 
   sound-flow-analysis:
     enabledIn: '3.9.0'
@@ -209,6 +210,7 @@ features:
       }
     # See https://github.com/dart-lang/language/issues/3100
     help: "Assume sound null safety when computing type promotion, reachability, and definite assignment."
+    expired: true
 
   null-aware-elements:
     enabledIn: '3.8.0'
@@ -220,6 +222,7 @@ features:
         }
       }
     help: "Null-aware elements and map entries in collections."
+    expired: true
 
   inference-using-bounds:
     enabledIn: '3.7.0'