Help>?

我沒有他們老。

Is this correct? If not, how would you say "I'm not as old as them" - or even better " In my Korean class, compared to the other students, I am the youngest".

Thanks ever so much :D

I prefer 我比他们年轻, or 我们他们（年龄）都小 or 他们比我大。

如果年龄差别大，用年轻，如果岁数差别小用 “大/小”

So,  " In my Korean class, compared to the other students, I am the youngest". should be 我在我上的韩语班上是最小的。