DS14 is 6'3" and wears a 13. Probably 14 by now
I think at 11 he was wearing about a 10, but it's hard to remember. That kid was 23" long at birth and hasn't stopped growing yet. At school they call him Tiny.
DD9 (almost 10) has huge feet. She wears a womans 9.5. I really wish she'd stop. She's already 5'3" or 5'4".