I do not know who is the youngest gambler but one thing is for sure, we should not blame any of these kids, children and teenagers gambling online because they are being funded by their parents to do so. Gambling needs money and these young people are not at the earning stages of their life.
This means that if they are gambling, the sole responsibility of this lies with their parents and they are accountable if in future it has a bad impact on these children's education, health and more importantly habits.
I don't think that these kids and teens are being funded by their parents. Just like me in the past, I snatch money of my parents to do stuff that I like since I don't have a job and I don't have money to do it.
So, I think that most of them are doing that. Getting their parents money without their knowledge for them to be able to gamble.
The parents task is vital with how they're going to understand that gambling at a young age is risky for their growth because they might be used to it.