noun
60th birthday celebration
A traditional Japanese celebration for one's 60th birthday, often involving a banquet and the honoree wearing a red hat and vest symbolizing a return to infancy.
父の還暦祝いに家族で食事に行った。
We went out for a family meal to celebrate my father's 60th birthday.
還暦祝いには赤いちゃんちゃんこ
There is a custom of wearing a red vest for one's 60th birthday celebration.