I've been running games from Chainmail (D&D's predecessor) up through 3.5 and then skipped 4.0 (mostly).
I ran my last campaign for 7 years and still run some play-by-post games on RPOL.net in addition to the live games at my home tabletop, local gameshops, and now online through Roll20! Yikes, the internet is taking me over!
Not counting convention one-shots, NeXt games, and Adventurer’s League, I've had the opportunity to play in 3 campaigns that I can recall. The rest of my time has been DMing.
I hope your own gaming journey is filled with unique and inspiring stories that have created amazing memories and lasting friendships that endure to this day. If they haven’t, ask to join one of my games and we’ll try to make some new ones, together!