I have been a player of Dungeons & Dragons (D&D) for over twenty five years. I have countless characters, dozens of hand-written adventures, blueprints for massive catacombs -- even an entire world that I created so that my gaming groups would have an endless array of new places to explore. I can explain to you what THAC0 was (To Hit AC 0), how Player's Options worked, and why the Monk class was one of the most interesting to play (can anyone say Flurry of Blows).
I can min/max a character like there is no tomorrow, and still remember coloring in my first set of dice with the wax crayon that was provided in the Basic Set.
I am a designer and an illustrator largely because of my time with D&D. The game, and the social interaction that came with playing, taught me many life skills that I use on a daily basis: Problem solving, creative and critical thinking, writing, and even social skills like teamwork and negotiation.
I am still best friends with my very first DM (Dungeon Master).