i think many of gambler start gambling in under of 18 years, because we can make little sample. maybe we already know that in our school, sometimes we talk to our friend that we can hang out with a girl that really famous on our school, and if we can not hang out with that girl, we can buy some drink to our friend and sometimes, other friends will said "i bet he can not hang out with that girl, i bet $10". so i think this is include in gambling too, right? Grin its just a small thing that maybe we don't realize but its money involves with that.