he is12years后面是：old；

句型：He is 12 years old.他今年12岁。

old

adj.具体年龄;(多少)岁;年纪;老的;年纪大的;不年轻的;老年人

比较级： older最高级： oldest

例句：

I went to see if my old school was still there.

我去看过母校是否依然存在。

She's getting old ─ she's 75 next year.

她上年纪了，明年就75岁了。

Can you really get that old car going again?

你真能让那老爷车再跑起来吗？

Old values are being grafted onto a new social class.

旧的价值观念正植根于新的社会阶层。