i personally start gamble on age 25 or so i guess. as gambling need a mature thought not kids thought. they will never gamble responsibly, this is important to noticed that regulation on under age forbidden to gamble are necessary.
Yes even though parents are good in guiding their children still the surrounding where the kids are coming altogether with their friends are the most influential individuals and are responsible when a kid learns how to do some crazy things like gambling. Because I had experience that way back in high school even though my parents are very tight on me as I grow up still I am being influenced by my classmates and exposed me to gambling.