Anonymous wrote:I'm the oldest and shortest in the family. I think this is one of those instances where you just tell her we can't control how tall we grow- all we can do is eat healthy food and be happy with who we are. Is one of you short? If so, I'd say, see, you're built more like I am (and my sisters) or whatever, and little bro takes after so-and-so, because we're all different, blah blah.
I could have written this. I'm older and shorter than my sister and I hated it growing up. I hated how people always thought she was older. So just try and separate out height = age and teach something of genetics - maybe with eye or hair color? Good luck.