>>7692850375 is the first one I remember getting, though I'm not sure what my first was. I had a few 1975-78 sets as well but they were still on shelves in the early 80s.
>Which set or theme did you like the most as a kid?Classic Space. I did so many weird alien, robot and spaceship mocs as a kid.
>What’s your favorite(s) as an adult?I think it's slightly shifted to be Castle, both the classic version, the later fantasy Castle Era and Kingdoms and even weird shit like Knight's Kingdom.