台Taivo A Taiwan Mandarin dictionary

大壽

dàshòu

ㄉㄚˋ ㄕㄡˋ

Simplified 大寿

1(polite) birthday making the beginning of new decade of life for an older person, especially over 50 years old (e.g. 60th or 70th birthday)

Keep 大壽 and it comes back until you know it.