Starting running games when I was 12 years old in 1986. I have run the following games: BECMI and Rules Cyclopedia DnD, 1st and 2nd edition ADnD, 3.0 and 3.5 DnD, Gammaworld, Boothill, Marvel Superheroes, Gangbusters, D20 Modern, D20 Future, Top Secret/SI, RIFTS, TMNT, Robotech, Ninjas and Superspies, Classic Traveller, Traveller New Era, Twilight 2000, Merc 2000, Cadillacs and Dinosaurs, Dark Conspiracy, TWERPS, Call of Cthulhu, StarWars (WEG), Shadowrun, Mechwarrior, Cyberpunk 2020, Cybergeneration, Vampire, Werewolf, Afterlife, BESM, Carwars, Aliens, plus some homebrew systems. Played in a host of other games over the years, including RoleMaster and Paranoia. I am returning to TTRPGs after almost a decade hiatus due to a toxic group.
I tend to prefer more serious, adult games, but am not opposed to beer and pretzels gaming. Or anything in between.