diff --git a/CHANGELOG.md b/CHANGELOG.md
index f5feec00c4..4b10c8d123 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,7 @@
 
 ### Client
 - Enhance: TLの返信表示オプションを記憶するように
+- Enhance: 投稿されてから時間が経過しているノートであることを視覚的に分かりやすく
 
 ### Server
 - Enhance: タイムライン取得時のパフォーマンスを向上
diff --git a/packages/frontend/src/components/MkNoteDetailed.vue b/packages/frontend/src/components/MkNoteDetailed.vue
index 273984cc0a..4f40feffdd 100644
--- a/packages/frontend/src/components/MkNoteDetailed.vue
+++ b/packages/frontend/src/components/MkNoteDetailed.vue
@@ -94,7 +94,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<footer>
 			<div :class="$style.noteFooterInfo">
 				<MkA :to="notePage(appearNote)">
-					<MkTime :time="appearNote.createdAt" mode="detail"/>
+					<MkTime :time="appearNote.createdAt" mode="detail" colored/>
 				</MkA>
 			</div>
 			<MkReactionsViewer ref="reactionsViewer" :note="appearNote"/>
diff --git a/packages/frontend/src/components/MkNoteHeader.vue b/packages/frontend/src/components/MkNoteHeader.vue
index dda7238d27..52d5b03685 100644
--- a/packages/frontend/src/components/MkNoteHeader.vue
+++ b/packages/frontend/src/components/MkNoteHeader.vue
@@ -15,7 +15,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 	</div>
 	<div :class="$style.info">
 		<MkA :to="notePage(note)">
-			<MkTime :time="note.createdAt"/>
+			<MkTime :time="note.createdAt" colored/>
 		</MkA>
 		<span v-if="note.visibility !== 'public'" style="margin-left: 0.5em;" :title="i18n.ts._visibility[note.visibility]">
 			<i v-if="note.visibility === 'home'" class="ti ti-home"></i>
diff --git a/packages/frontend/src/components/global/MkTime.vue b/packages/frontend/src/components/global/MkTime.vue
index d06aa036e7..5ba13ca3f3 100644
--- a/packages/frontend/src/components/global/MkTime.vue
+++ b/packages/frontend/src/components/global/MkTime.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<time :title="absolute">
+<time :title="absolute" :class="{ [$style.old1]: colored && (ago > 60 * 60 * 24 * 90), [$style.old2]: colored && (ago > 60 * 60 * 24 * 180) }">
 	<template v-if="invalid">{{ i18n.ts._ago.invalid }}</template>
 	<template v-else-if="mode === 'relative'">{{ relative }}</template>
 	<template v-else-if="mode === 'absolute'">{{ absolute }}</template>
@@ -22,6 +22,7 @@ const props = withDefaults(defineProps<{
 	time: Date | string | number | null;
 	origin?: Date | null;
 	mode?: 'relative' | 'absolute' | 'detail';
+	colored?: boolean;
 }>(), {
 	origin: isChromatic() ? new Date('2023-04-01T00:00:00Z') : null,
 	mode: 'relative',
@@ -75,3 +76,13 @@ if (!invalid && props.origin === null && (props.mode === 'relative' || props.mod
 	});
 }
 </script>
+
+<style lang="scss" module>
+.old1 {
+	color: var(--warn);
+}
+
+.old1.old2 {
+	color: var(--error);
+}
+</style>