I'm American, despite the Ukrainian flag on my profile. And I think most of the people I grew up with in the States had terrible handwriting, just like me. I always assumed it was just because we had switched to typing from handwriting (sure, when I was in elementary school I wrote things, but from high school on, all my correspondence with other people and most school stuff was typed). I mean, if the only thing you see about him that seems "young" is his handwriting and drawing, that doesn't really mean anything. I'd be more concerned if he actually behaved like a small child or exhibited strange, childish behaviors. Drawing and handwriting is nothing. I knew a girl in art school who always drew like a child, even after years of studying drawing. Nothing was wrong with her, that was just her style. Likewise, I've known lawyers with awful, childish handwriting. Nothing wrong with them.