答案：He is as old as I/me.
I'm as old as he/him.
He is (of) the same age as I/me.
I'm (of) the same age as he/him.
注：/ 表示可以任意选用其一；（ ）表示可以省略不写.
另：比较级的写法一般是：
1）as + 形容词/副词原级 + as...
2）the same...as...
3）形容词/副词比较级 + than...
如：I‘m taller than he.
I run faster than she.