问age前面用a还是an

用anage名词，意为“年龄”（1）at one's age 意为“在某人这般年纪时”。

例如：Your father began to work at your age.你的父亲在你一个年纪时就开始工作了。

（2）at the age of 意为“在……岁时”。例如：At the age of seven（=When he was seven）,he could swim.7岁时，他就会游戏了。Let's have a try.