Bulma, Goku and others in “Unfinished Business”

What? Say it.

Well, it's uh... just that you look middle aged.

Shut your rude mouth! I'll have you know that most people think I look good for my age! Excuse me for not being an alien monster that never changes!

Vegeta

We Saiyans evolved as a warrior race. We retain our youthfulness so we can fight longer.

Hmph! I guess your race didn't evolve with enough brains to have good manners!