I think as we get older, Real Life gets to be harder and harder on us even if what we're doing there doesn't change, leaving us with less and less mental and emotional energy to spare. Guess there's a reason it's called "the Springtime of Youth".
I am in the process of restarting the Löve RPG framework project I was working on back when, though. We'll see how far I get with that this time before flaming out.