I do play the original Mario games quite a lot but I find that when I go back to them I usually go back to remakes or ports (either the GBA ports or Super Mario All-Stars on SNES.)

To those fearing that you are too young: It's never to late to give it a go! Atari 2600 went on sale a good six years before I was born but I can think of more than one Atari 2600 game I can easily spend hours on.