We can quibble about the actual age but in principle I agree about GTA. That's because it's a game designed to be fun for kids.

Let me tell you about elements of games I'm thinking about:

A girl is bullied at school to the point of committing suicide. This isn't a game of vindication. Justice isn't served. Things aren't set right. It's just how things are.

Your brother committed suicide a year ago. As part of the game you have to deal with someone who blames you for it.

A couple has to deal with the grief of their baby drowning in the bathtub. It's not an abstract thing. You as the player have to ensure the baby drowns and set the conditions for it to happen, knowing full well this will be the outcome.

You're a scientist stuck in a weird dimension and trying to figure out how you got here. Well, you got here because you murdered your wife and kid and then killed yourself but before you did that you made a copy of yourself and your family in a virtual world. That plan didn't work out well.

Edit: Just in case anyone gets deceived, the games aren't about these things but they do explore them as part of the game. The point is a lot of modern mature games tackle very adult topics.

It's been a long time since I kept current on games.

Reading these descriptions, I have only one comment:

What the *HELL*?!!?!!!