DD didn't loose her first one until 7. Late. DS, who is almost 3 1/2 is about to lose one of his top front teeth. Ugh. It is already a crown. He had dental caries (baby bottle rot) when his top teeth came in from the bottle being propped in his nursery. I think.
I guess the age just depends on the teeth coming in behind them. I bet there are other kids at school who have lost teeth. Let them tell him how much they got from the tooth fairy. That might excite him.
Lol- We are going out of town and all 3 kids have a loose tooth. DD 7 may finally lose a top, DD 11 has her very last baby tooth coming out (the only one I will get to save for her

, and poor little DS might lose his crown. Hopefully, the tooth fairy can wait until we get back.