I started in 1976 at 16 with a friends tank and reg. Before that I was always using a mask and snorkel in the lake my family had rental cottages on. I got my first cert in the fall of 1979 at 18 in my first year at collage, the cert course was $25, you supplied mask fins and snorkel all other gear was supplied. Open water divers at Fort Weatherall, RI in the snaow was fun.
As for tech, well we were all just wreck divers then, I had my first set of doubles by 87 or 88 and took the NITROX course when it was still looked at as a death gas by the industry in 92 or 93. I don't really remember when "tech" came along but it was sometime in the late 90's.
I still don't ever call myself a tech diver, I'm just a wreck diver.