I was a member of the L5 Society [1] in the 80s where we would meet on the Intrepid aircraft carrier in Manhattan to discuss all things space and space colonization (L5 being the Lagrangian point in the Earth-Moon system to place space habitats 60-degrees behind or ahead of the Moon's orbit for stable gravitational equilibrium to minimize fuel or energy to maintain that position). L5 later merged with the National Space Institute under the National Space Society (NSI was Werner von Braun's baby).
I had read O'Neill's 1974 article, "The Colonization of Space" when I was 10, in Physics Today that got me hooked before L5. I bought a Commodore PET 2001 in 1977/78 and was writing a program to show the on orbital plane view of Jupiter's 4 major moons - Io, Ganymede, Callisto, and Europa to better identify which was which when using my binoculars at night. I left L5 in 1988/89. Good times at the Galaxy Diner after the monthly meetings on the Intrepid.
I stopped devoting time to space around then and didn't pick up an avid interest again until SpaceX, even though I had done some machining work for some models of subassemblies for the Spirit and Opportunity Mars rovers in the early 2000s. I am now back at making machines and dreaming of space again!
[1] https://en.wikipedia.org/wiki/L5_Society