Short and undistinguished list here..
Late 1960s. Royal Enfield Crusader Sport.
Then briefly, a Durkopp Diana 250 cc scooter..with electric start!
Never got around to passing a bike test and got my first car..a 1958 Opel Olympia Rekord.
Couldn't afford cars AND bikes through 70s
80s I couldn't afford to use our only car to get to uni as a mature student, so got a Honda CD175 s/h which wasn't strictly legal..for a few months till I got a Honda CB125T. One of the last before power restrictions on 125s, so a massive 15.5 bhp at the back wheel or somesuch. Still it was a little screamer revving to about 12k, or nearer 20k on a missed gear change...Great fun.
I always had a dream to get a vintage British bike, something 500cc upwards restore it and take it across the pond to 'do' Route 66.
Obviously not a big enough priority though as I never got close.
Now I can afford to get a full license and a big bike..but at 75 it's possibly not a great idea....