First of all: Don't interpret what you want to hear into what your opponent is actually saying, it's impolite and dishonest.

1st: The reasons how/why people under 18 are able to play the game are irrelevant to this argument, the only thing i said is that they are, which is undeniable.

ESO is a mature rated game. What do you mean by younger? younger than you? or Younger than 18? Anyone under 18 playing this game is doing so with their parents permission and credit card.

This statement you made in your first response is therefore wrong and invalid, which makes me addressing the younger/underaged population of that game reasonable and, in my opinion, important and necessary. And even if it was only children with the permission of their parents playing this game, it still doesn't change the fact that they are.

2nd: The idea that the only way children can buy 18+ content is with the permission of their parents and access to their credit card is just ridiculous. Everyone can create and use a Paypal account and similiar services, bank account/credit cards(at least in my and most european countries, i actually never heard of a country where it's different) are accessable for people under 18, i myself had my first bank account when i was 14.

3rd:

So using your logic. We should remove age restrictions in casinos and bars because that shit really doesnt work?

Not the same, not even comparable. Casino and bar restriction can actually be imposed on people by asking and checking their ID. This of course COULD also be done for online games, but it isn't so i don't see what your point is.