How young is too young to wager?

[saucon17]

My dad started to take me to the track at about age of 12-13. He used to make $3 WP on each race of the track we were at. Usually Philly, Penn and Delaware. When I was 16 I could make bets and they usually never questioned me. The greatest thing now is my dad and I usually go to Delaware Park every Sat. or Sun. throughout the meet. My dad and I don't agree on somethings, but the track we always agree on.