age指的是年龄，用于形容人的岁数和动植物的年龄。

years指的是多年，不能用于形容一岁。而且表示年龄的时候要和old连用。

例句辨析：

age

1、She has a nephew who is just ten years of age.

她有一个才10岁的侄子。

2、Everything in the room looks in keeping with the age of the building.

房间里的一切看起来都与这栋建筑物的存在年头很相称。

3、Perhaps he has grown wiser with age.

可能随着年纪增长，他变聪明了。

years

1、The paintings in the chapel were perhaps a thousand years old

小教堂里的这些画可能有1,000年的历史了。

2、He's only 24 years old and a drug addict.

他只有24岁，却是个瘾君子。

3、At 62 years old, her voice sounded just the same as it did when she was 21.

她62岁了，但嗓音还和21岁时一模一样。