We’re about the same age, Paul, and have been playing games for about the same amount of time. Whether you’re a short campaign kind of player or a longer campaign kind of player, we all know that some games are better than others, live longer in the memory, or hit more of the right notes. Here’s the thing then, just like the days of our lives or the length of our lives, not all experiences are created equal; simple arithmetic doesn’t work. I’d count a certain Torchbearer campaign with friends, a Labyrinth Lord campaign with a full table of novices at a club, a couple of Burning Wheel campaigns, including one I’m playing in now, as amazing times which outshine and outweigh so much other gaming over the years, as entertaining as it might have been on any given evening. Your very best game ever might be the last one you play; your last day might be the best one you ever live.
There’s an old farmers’ saying which runs “live every day like it’s your last, farm every day as if you farm forever.” It’s a bit broken in these days of industrial ecocide, but it might easily be adapted to gaming. It’s not how many days you live or games you play that matters.