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1·In some sports you're past it by the age of 25.

在某些运动中，人过25岁就难有作为了。《牛津词典》

2·Children ought to be able to read by the age of 7.

儿童7岁时应该识字了。《牛津词典》

3·She will start with a low one-inch heel and build up to a towering five inches by the age of 23, as she teeters into womanhood.

随着她从女孩变成女人，她将从1英寸的低跟开始，到23岁时逐渐增加到5英寸的高跟。

4·By the age of 21 he controlled the company.

他21岁就掌管了公司。《牛津词典》

5·By the age of sixteen he was the junior lightweight champion of Poland.

16岁时他已是波兰少年轻量级冠军。《柯林斯英汉双解大词典》

6·By the age of 25 she was completely burned out and retired from the sport.

她到25岁时就已体力耗尽，退出了体坛。《牛津词典》

7·Most children by the age of 8 or 9 can only remember 35% of their experience from under the age of 3 according to the new studies.

根据新的研究，大多数8或9岁的孩子只能记住他们3岁以前经历的35%。

8·For both girls and boys, it is usually complete by the age of 18.

对于女孩和男孩来说，它通常在18岁以前结束。

9·He was still working by the age of 70.

到70岁的时候，他仍在工作。

10·Most people will have some grey hair by the age of 35.

大多数人在35岁会有灰发。