Hi, I'm new to the gaming world but my 13 year old son is well and truly hooked! We upgraded our ps3 to a ps4 a while back and recently my son has discovered a game series that has 2 games that are only on the ps3. He's asking to buy these 2 games and I'm just not sure. Is it the done thing to buy games for old machines? I feel like it's going backwards! He said he's watched others play the games on youtube and wants to play himself. I get that, but it seems odd to me. Would any of you have done that? Or your kids? I'd appreciate any advice! The game is Infamous if that helps!