如题所述
at the age of+某人岁数
【例句】
At the age of 18,LiMing learned how to drive cars.在李明18岁时,他学会了如何开车.
2.in one's+数字基数词复数
in his twenties在他20岁的时候in Wanghua's sixteens在王华16岁的时候
谢谢