I have the same issue with the trial-and-error gameplay of many of the older games, which all but require that you fail repeatedly until you memorize the proper way to make it through the game. Also, many of these games don't have infinite lives/continues, so it requires a larger time commitment to start the game from scratch.
However, I have the opposite experience with things like top-down action games and racing games. It's probably because I've spent so much time with 3D games over the past decade or so, but I've found that my skills have actually improved in these games. I've gone back and replayed some of these, and I've actually gotten further along on my first attempt than I was ever able to do when I was younger.