I'm 38 with a pregnant wife due in 4 weeks and a 2 year old. My gaming time is practically non existent anymore. At most I can usually do is casual games with my time because I'm lucky to have an hour to game. Most games I want to play require longer time sinks to enjoy fully. I've been trying to finish the recent release of DOOM, on map 11 now, but every map takes 2+ hours to complete if you grab all the secrets. So I'm lucky if I get one 2+ hour gaming session in a week for DOOM. At least with DOOM I don't really have to remember what the hell I was doing last or how my skills all work or some such bullshit that RPG based games would require of me. Which is why I have finished Fallout 4 yet either. I took so long getting back to it I don't have a clue where I left off and don't want to restart the game at the moment because I know I don't have the time at the current state in my life to devote to restarting it and beating it.
I will say that my friends that do have kids all 6+ play a ton though as they play with their kids. With the kids being more or less self sufficient, it allows them the ability to spend more time gaming. Right now I am not in such a place in my life.
My desire for good gaming hasn't waned, just I know I don't have the time to devote to fully enjoy most games.
So basically most of my gaming is hearthstone, sudoku, and the occasional level on DOOM.