十几岁的时候英文

inone'steens,表示“十几岁”，inone'stwenties,表示“二十几岁”另外，这两个词组都可以有下列表示方法，inone'searly/mid/lateteens,分别表示“十二三岁”，“十五六岁”和“十八九岁”；inone'searly/mid/latetwenties,分别表示“二十二三岁”，“二十五六岁”和“二十八九岁”。这些表示年龄的说法，都是很笼统的说法。不是十分精准。其他年龄段也可以用这种表达方法。如，thirties,forties,fifties,sixties,seventies,eighties,nineties.

在他十几岁：at one's tenth

He is a teenager.

He is a teenager.He is a teenage boy.He is in his teens.( in his twenties二十几岁，in his thirties....)

more than ten years old

in my teenage years或者When I was a teenager, ...

In his teensWhen he is in teens

10 many year old

When he was a teenager