她首次登台时年仅14岁。

She first appeared on stage ___at ___the ___tender ___age ___of 14.

她在14岁的稚龄遇见了我的父亲，并很快知道这就是她想共度余生的人。

She met my father ___at ___the ___tender ___age ___of 14, and she soon knew that this was the man she wanted to stay with for the rest of her life.

他年仅19岁就开始创业。

He started his own business ___at ___the ___tender ___age ___of 19.