but is it possible that most gamblers who got addicted are old people past retirement and have nothing else to do anymore?
I don't think age affects gambling problems. Both young and old like to gamble.
What influences people to gamble is actually the financial factor. This is my personal opinion.
Because they think if we do gambling we can get a large amount of money without having to work hard. Especially those who have ever gotten a large amount. This is what influences their way of thinking to become addicted to gambling. And if they are addicted, it will be difficult for them to stop gambling.