If I remember correctly, my first roll of film would have been around 1974 ( I was six or seven ), I was likely shooting Kodacolor II in a Kodak Dual-flex IV (620)... I don't ever remember any pictures that weren't fuzzy.
From there, various relatives gave me their old Brownies and other relics as they unearthed them... one aunt gave me the Kodak Jiffy-616 folder that she had bought around 1932... a that time, I could stil l buy Kodacolor at local drugstore in: 120, 620, 116, 616, 828, as wel las 110, 126, and 35mm.
I felt like I was a "real adult" when I was about 10 years old, and my Dad let me use his Nikon S ( under his supervision). Dad shot either Kodachrome or Tri-X 400.
After that, I used a variety of Argus C-3 "bricks", until senior year of High-school, when I picked-up a Retina IIIc outfit from the father of a school-mate. That was my first "real camera" (Dad wasn't giving-up the Nikon!).... I shot many rolls of film through high=school and college with the Retina...
There was a period of about 10 years when I really didn't take many pictures, then in my mid-30's, I picked-up my first SLR: a Minolta XG-1 kit at a rummage sale.... it had the motor-drive, a wide range of lenses, filters, flashes, etc... so I figured I might as well learn how to use that.
That re-awakened my interest in photography, as well as my interest in old cameras...
Since then, I've had a serious case of GAS, and am shooting a LOT of film, during its twilight years.
I have to order some Kodachrome , and have a last blast with that during the fall and winter... I hope I can get my darkroom set-up and running before film goes away...
I think from the early 1960's on, most high-end RF cameras and SLRs still compare favorably with modern DSLRs, in terms of optical quality...
Lenses like Pentax's SMC (super-multi-coated) probably offered some of the biggest improvements.
Computers have helped improve lens design by virtue of being about to carry the mathematical calculations to a much finer degree than was possible in the days of the slide-rule...
These days, my user camera is an "ugly" Leica III from 1934, usually shooting an un-coated Elmar 35... I shoot anywhere from two to six rolls a week... mostly documentary stuff around work. I get respectable results from this 75-year-old camera... good enough that I'm in no hurry to go digital.
Regards,
Luddite Frank