大だい還かん暦れき

noun

120th birthday

A celebration of reaching 120 years of age, twice the traditional 還暦 (60th birthday). Rare in practice, but used in longevity contexts.

• 大だい還かん暦れきを迎むかえる人ひとは極きわめて稀まれだ。

  People who reach their 120th birthday are extremely rare.