They are both legal so it's fine in my opinion. My parents have a much larger age gap where my dad is almost the same age as my grandpa. It explains why she is so mature as well since she isn't a young kid anymore.
@3413413241234 I have been single since high school and I'm 29 now and work as a high school teacher. That story is just so damn common that it scares me as a dude. My crazy thoughts always go to a weird place and settle on the back up question of "Do yo have an older sister" Hahahaha