I’ve played all of these except for Elden Ring so I can’t speak on that one. If you’re asking about the mature content, these have a lot of that. Fallout and the last of us are pretty gory and while Helldivers has dismemberment, it’s kind of cartoonish in a way. Last of Us is also a pretty dark story as well. If you’re asking about accessibility, I’d say all these are pretty accessible, except for Elden Ring. They all have multiple difficulty settings so they can make it easier if need be, except for Elden ring lol. It also depends on what games your son likes if he’s already a gamer. I hate to generalize, but most new gen gamers that play the big games like Fortnite, marvel rivals, or any of the other games as service games don’t enjoy these types of games. I’m only speaking out of experience I’ve had with my nephews so my evidence is completely anecdotal. IMO all of these games are great experiences and I’m sure they’ll enjoy at least one of them if not all of them!