It's funny but no one ever mistook my Grandma or my cousin (both 5'0) for incapable. I'm not sure about the seeming too young part, I'd guess no. They both had/have a power about them that stood/stands no nonsense.

And 5'6 is no picnic either. Sure I can reach almost everything I want but I can't find a fella about 6'0 tall to date 'cause they all hooked up with the teeny girls. :-)