他十岁了用英语表达是：He is ten years old；
years：
n. 年; 日历年; 一年时间; 与某事相关的一年; 年度。
year的复数。
old：adj. 古老的; 老的; 具体年龄; (多少)岁; 年纪; 年纪大的; 不年轻的; 老年人。
相关介绍
He is ten years old.
他十岁了。
It is his birthday; he is just ten years old.
今天是他生日，他正好10岁。
He is either nine or ten years old.
他介于九到十岁之间。
He is ten./ He is ten years old.
他十岁。
I'd say he was 25 to 30 years old.
我猜他在25至30岁之间。
He was barely 20 years old and already running his own company.
他只有20岁，却已经营起自己的公司了。
I was twenty years old and ready for anything.
我当时二十岁，什么都愿意去做。
