I am thirteen.Myfriend is fifteen years old.怎么合并成一个句子

I am thirteen.Myfriend is fifteen years old.怎么合并成一个句子

这需要用到比较级了：
I'm two years younger than my friend.
或者：
My friend is two years older than me.
如果你没学比较级,就这样：
I am thirteen,and my friend is fifteen years old

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