I am ten years old.我今年十岁了。
例句:
This is the first year my little sister is even allowed to stay up till midnight, and shes ten already.

(图片来自网络侵删)
今年是我妹妹被允许玩到凌晨的第一年,她已经十岁了。
相关介绍years old的例句:
He was 14 years old when it happened.
这件事情发生的时候,他14岁。
The most ancient parts of the continental crust are 4000 million years old.
该大陆地壳最古老的那些部分有40亿年了。
By US standards, a genuine antique must be at least 100 years old.
按美国的标准,一件真正的古董必须至少有100年的历史。
Jenny is seventeen years old.
珍妮17岁。