I don't think age has any effect on gambling addiction. Personally, I have an opinion that, people who have more free time are prone to gambling addiction. They just start playing for fun and eventually finds difficult to get rid of it.
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I think it is because of the online gambling. Young people use smart phones in the streets, shopping malls, schools and colleges and their houses they use both, cell phone and computer. It means that now they can gamble from anywhere. No time limit, no certain place, 24 hours and everywhere. This is the main reason that young people are addicting of gambling.