I'm not sure how old he is
年纪───Age;并不───not
She had reached marriageable age.───她已经到了适婚年龄。
She lies about her age.───她谎报自己的年龄。
Technophobia increases with age.───随着年龄的增长，技术恐惧感越来越强烈。
At the age of 30, after a power struggle with a more experienced executive who had been hired to run the start-up company, he was out.───在他30岁那年，因为与被聘来经营这家初创公司的更有经验的高管发生了权力斗争，他离开了苹果。
At the age of 21, he started the rough journey of travelling around China in a wheelchair with a map and a compass.───岁的时候，这个年轻人竟怀揣一幅地图，手持一个指南针，摇着轮椅踏上了走遍全中国的艰难路途。
Her mother and she are planning to open an online shopping store and the clients would be children of her age.───她还和妈妈筹划开一家网上购物商店，顾客是自己的同龄人。
The age difference was a complication to the rela-tionship.
Jane is very mature for her age.
Adjust your language to the age of your audience.
It was difficult to tell his exact age.
Economy is the easy chair of old age.