nth-year student or pupil

oral history

historicism

historian

(Internet slang, especially anime and manga fandom) events or things from the past which one wants to whitewash/erase from history (due to it being embarrassing, poorly received, etc.); dark past

study of history

historic, historical / already-happened, past / former, old, traditional

100-yen shop, a common type of Japanese shop similar to dollar store or pound shop, where everything is sold at 100 yen.

year-round

61 years of age (in East Asian age reckoning)