I started playing in early '82, at the end of my junior year of high school. I had some birthday money, and went to the hobby store to buy a model rocket kit (model rocketry is among my other nerdy hobbies). They didn’t have any kits that I wanted, but as I turned away from the rocketry display, I saw a D&D boxed set on an end-cap display, and decided to buy that, instead.
I played a few games with my next-door neighbor, and decided to buy the AD&D books a few weeks later. Just after school let out for the summer, I was invited to play with a group, through a friend, and I was surprised to discover that that group was mostly people in their 20s and early 30s. I had a blast playing with them (they were playing the classic module “White Plume Mountain”), and they invited me to come back the next week. 39 years later, I still play sometimes with three of the people whom I’d first met and played with on that day.
A year later, I went off to college, and one of the first things I did was put up a sign on the bulletin board at my dorm, looking for D&D players. Within a week, I had a group of six players, and we played together constantly throughout college. I’m still close friends with most of them, too.
Like @What_Exit, I have a lot of 1E dungeons, and still have all of my books, too. My very favorite 1E module was the aforementioned White Plume Mountain, and I’ve run it again several times over the past 20 years, adapted for 3E D&D, 4E D&D, and 13th Age (a game system written by one of the 3E designers, and one of the 4E designers).