noun
60th birthday; kanreki
Celebration of turning 60 (or 61 in the traditional age reckoning), marking completion of one full sexagenary cycle. Often involves wearing a red vest or hat.
父は今年、還暦を迎えた。
My father turned 60 this year.
還暦のお祝いに赤いちゃんちゃんこを贈った。
We gave a red vest as a gift for his 60th birthday celebration.