That's awesome. I've been gaming one a week or more since 1980, but never with the same players for more than a few years... although I've had some core gamers last longer than that, but the groups change around us.
Late last year, our gaming group had it's 25th and last anniversary. Then the person that had been the major GM all that period said, basically, 'That's it, I'm done with gaming' and we've heard little or nothing from him since then.
I have one friend I've been gaming with since...1980, so 25 years now, but nothing like a whole group or even a name (do you have a name for your group?). Pretty impressive!