Allow me to introduce myself. My name is Zeb and I have been roleplaying and game mastering for over (cough!) 27 years! Crap I'm old. So with that in mind, I'll gave you a brief overview of my experience:
I started game mastering with Marvel Super Heroes (1986 publication) that I found at a garage sale when I was 15 (1996), that my friends and I would play during lunch periods in high school.
I played in AD&D (2e) for many years (16'ish)
I game mastered a 6 year long campaign of Legend of the Five Rings (d10 edition).
I have also game mastered 3rd edition D&D, 3.5 D&D, Pathfinder 1e, and now D&D5e.
I currently run Starfinder as well as a Curse of Strahd campaign on alternating Sundays with old high school buddies.