I started way back in the late 1950s with what I could buy as a pre teen kid. Airfix, 1/72 Revell, Monogram ,AMT and others. Then in 1969, Tamiya started for me. We had a great hobby shop in Iowa City (where I lived), and Cedar Rapids. I found that Panthers and Tigers and other WW2 stuff was what I liked to build. Did those until 1980 then started 1/48 aircraft because I had built almost all the armored kits. For a long period no new models were done, and some kits were discontinued. The Tamiya T34 was impossible to find in the 1980s. Things are very different now. I used to do a lot of conversions and Verliden kits back then. No need now. It's a new Golden Age of plastic kits.
I can remember when there was no 1/48 Me 109 E's except for a hard to find Monogram kit.
The one subject that I was always available was 1/700 ships, (my father was on a cruiser in the Pacific). So those were all built as well.
Modelers have it so nice now.
Doug