生せい誕たん百ひゃく年ねん

Meanings

1

noun

100th birthday anniversary

Used for the centennial of a person's birth, often in commemorative contexts such as exhibitions or memorial events.

year, counter for years

生せい誕たん
生誕 means 'birth' (formal), while 生誕百年 specifically refers to the 100th anniversary of a birth.
百ひゃく年ねん祭さい
百年祭 is a centennial festival or ceremony, not necessarily tied to a person's birth.

Compound of 生誕 (birth) and 百年 (one hundred years).