1. 在......岁时：became interested in 对......感兴趣 | at the age of 在......岁时 | see sb. doing 看见某人正在做某事
2. 在......年龄：8.at weekends 在周末 | 9.at the age of 在......年龄 | 10.come here at half past two every Saturday afternoon 每个星期六下午两点半来这儿
3. 在...几岁时：14. now and again有时 | 15. at the age of 在...几岁时 | 16. agree to do sth. 同意做某事
4. 在......岁的时候：at present 目前,当前 | at the age of 在......岁的时候 | B be able to 能够......;得以......
1. The team interviewed 885 new mothers about caffeine intake and infants'sleep habits at the age of 3 months.
2. He obtained his philosophy degree from Cairo University at the age of 23, at a time when many Egyptians had only a primary education.
3. Screen legend Sophia Loren is to grace the cover of the world famous Pirelli calendar at the ripe old age of 72.
4. Having her right leg amputated at age nine due to the discovery of a cancerous growth has taught her patience.
5. Tsai Chin Zhou's lifelong interest in performing makes her still active on stage at the age of 75.
6. Geologists at Rhode Island's Brown University used carbon dating to measure the age of sediment on the lake floor.
7. Jackson died at age 50 on June 25 after going into cardiac arrest in the bedroom of his rented mansion.
8. Jackson died suddenly from cardiac arrest in Los Angeles on June 25 at the age of 50.
9. He began her art career at the age of 12 and went on to study at the Central Academy of Art and Design.
10. He learned to play piano at the age of 7 and later learned cello, composing and conducting at China Central Conservatory of Music.