We've only been gaming, period, for about 15 years. There's 2 of us from the original group, one that joined a couple years after we started (Sanzuo), one about 10 years ago, and the other (our newest roommate) for about 2 years.
I was wrong in my xp comment, our longest game was actually the first one ever back in 2e days - we played between 1 and 5 times a week (heading over to my friend's house after school most days) with 5-10 players for a few hours a day and marathon 12-hour sessions sometimes on weekends. We'd detour into other gaming systems (Alternity, d6 Starwars, Warhammer 40k Miniatures, and of course LAN parties), but it was pretty regular for about 3 years.
At the time, I didn't even know what fudging was, so I'd say about 2-3 characters died a month yet, despite that, there were 3 PCs that were never killed in the duration of the campaign. The player who only played wizards went through about 15 of them and one individual wizard of his died 10 times in a row before killing himself in such a way that he couldn't be brought back thanks to an artifact robe he found.
Since then, the longest game I've played in or ran has been about 2 years(playing 3-4 times a month).