FAQ: Does hair growth increase after waxing?
Only medications or hormonal changes will increase hair growth, waxing doesn’t. Also shaving doesn’t increase the hair growth. It just seems that way, because instead of hair with a soft, relatively thin hair end, there will always be a (thick and blunt) stubble present.
So if you have shaved or waxed your legs when you were a teenager, and you subsequently have more hair, this is not a consequence of shaving or waxing, but of hormonal changes. You would have got those extra hairs anyway, even if you had not shaved or waxed.