First off lemmie just say that Modern M-Rated titles Suck! These games contain way way too much Extreme Swearing and Sex. That's one reason why I'm a Retro Gamer. Plus,I Hate the fact that most modern titles are basically playable Hollywood Movies.
Anyway,What constitutes as True Retro in Gaming? Answer: Everything up to Dreamcast is True Retro Gaming. Everything else beyond is modern. The only execption is the GBA,which itself is a Retro Gaming System.
I don't care if The PS2,XBox,Game Cube,ect. are over 10 years old,they don't and will Never Ever count as Retro! They are instead "Older Modern". Sure the games from those systems may be "Old" but they ain't Retro. It's more than just the graphics and sound that makes a game Retro,it's the attitude. And the attitude of the games for the mentioned systems are Modern.
And there's the answer to the question of the day!