The actor achieved fame by the age of 22.

那位演员22就成名。

By the age of 14, he was playing internationally.

到14，他开始在国际上下棋。

By the age of three, he was able to read.

到三，他已经识字。

By the age of sixteen, Frank had ditched school altogether.

法兰克16的候就辍学。

Baldness affects approximately half of men worldwide by the age of 50.

全球大约有一半的男性在50顶。

For both sexes, it is usually complete by the age of eighteen.

男孩和女孩通常在18结束青春期。

Do you know he was a multimillionaire by the age of 35?

你知道他在35已经是千万富翁吗？

He had mastered both integral and differential calculus by the age of 15.

他在15就已经微积分。

By the age of seven, children are capable of thinking in abstract terms.

【abstract】儿童到七就具有抽象思维的能力。

By the age of 14, he was fit enough to pose for anatomical charts.

在十四，他已经够健壮到能当人体结构图的模特儿。

So much so he taught himself French and English all by the age of 6.

所以他在6是就开始自学法语和英语。

This give-and- take allows them to use fluent sentences by the age of four.

这种“输入并输出”的方法让人类儿童在四就能使用流利的句子。

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

无论男孩子还是女孩子，通常都是到 18 完成（青春期）。

By the age of twenty-five, I had managed to get married ... and also divorced.

25，我不仅完成结婚这件大事，也经历离婚。

Blood tests indicate that most children have had it by the age of 5.

血液测试表明，大多数儿童在5就患有此病。

Each Indian of the Great Plains could ride a horse by the age of five.

大平原地区的每个印第安人五就开始骑马。

One patient, who began puberty blockers aged 12, suffered four fractures by the age of 16.

一名患者在12开始服用青春期阻断剂，16发生四次骨折。

By the age of 12 nearly every child has a phone, according to research in Britain.

英国有研究表明，到12，几乎每个孩子都拥有一部手机。

The study challenges the commonly held notion that intelligence is 'static' by the age of about 18.

人们普遍认为，智商到18左右就“静止”，此研究否认这个说法。

He was the youngest of 7 children and by the age of 5, he was already composing music.

他是7个孩子中最小的一个，5的候，他就已经开始作曲。