diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 2abf4675a..1475dc2e2 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -1190,6 +1190,10 @@ desktop/views/pages/user/user.header.vue:
   following: "フォロー"
   followers: "フォロワー"
   is-bot: "このアカウントはBotです"
+  years-old: "歳"
+  year: "年"
+  month: "月"
+  day: "日"
 
 desktop/views/pages/user/user.timeline.vue:
   default: "投稿"