The youngest are three years of age.

最小的只有三岁。

Mostly starts between 20-30 years of age.

大多开始于 20-30 岁之间。

Polio mainly affects children under 5 years of age.

脊髓灰质炎主要影响五岁以下儿童。

The game is for children over 10 years of age.

游戏适用于十岁以上儿童。

40 percent of them are under 50 years of age.

其中有40%年龄在50岁以下。

All of them were 12 years of age and older.

他们的年龄都在12岁以上。

At just 17 years of age, he is still too young.

他只有17岁，年轻太小。

Who, for the newcomers, is all of 18 years of age.

你们可能不知道，他才刚刚18岁。

The oldest were about fourteen years of age, the youngest, eight.

最大的十四岁，最小的才八岁。

The people were between 18 and 30 years of age at the time.

当时受试者的年龄在18到30岁之间。

Those over 65 years of age are being told to avoid unnecessary outings.

65岁以上的人被告知要避免不必要的出行。

By two years of age, none are left, essentially causing " menopause before menarche" .

在患儿两岁时，已基本没有卵细胞保留，导致“初潮前的更年期”。

He was some fifty years of age, and his popularity was at its height.

他年纪五十上下，名望也达到了顶点。

And some children begin to tell lies as young as two years of age.

很多孩子在2岁的时候就已经学会了撒谎。

U.S. federal law bans the sale of e-cigarettes to anyone under 18 years of age.

美国联邦法律禁止向未满18岁者出售电子烟。

At 35 years of age, he was the youngest person ever to receive the award.

获奖时，他才35岁，是世界上获得该奖项的人中最年轻的。

The dinosaur is thought to have died at between 15 and 20 years of age.

这只恐龙被认为是在15到20岁之间死亡的。

Whether this individual was thirty-five or fifty years of age, I could not precisely state.

这个人究竟是三十五岁还是五十岁，我可不能确定。

They often leave their mother's herd when they reach 10 to 20 years of age.

它们通常在10到20岁时离开母象群。

In the US, the government restricts anyone under 18 years of age from voting in elections.

在美国，政府限制任何未满18岁的人在选举中投票。