JoJo's Bizarre Adventure - Why Mom.

Sometimes I forget just how young Josuke really is.
But then scenes like this show up and I remember he's still just a teenager.

Man, why can't JoJo villains wait, like, 5 more years before springing their plan into action. Give some of these kids a chance to grow up. (Although I suppose in Jotaro's case that wouldn't have helped seeing as the man apparently ages in reverse)

So, do Japanese mom's not bother taking off The Chancla when they discipline their children?