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.
Maybe experience can help us to stay away from addicition with the young people the experience of life may not be found at most time but if some one having much free time to spend they will be addicted to something for example if we are spending time with social media then it be our daily routine to check the social media every morning so which is an addiction so it same applies to gambling too.