Yes, like others here had no first 'grown up' ride as such as started riding at about 5, and then rode with no major breaks til in my mid 20s. Lived in the middle of nowhere, so if I wanted to see my mates in other villages, it was a case of cycle there. Then in my 20s did a bit of touring.
Stopped riding for a few years and my first ride when I returned, several years ago, was on a
Halfords BSO which I probably (don't remember) got as far as the next village - about 1 1/2 miles - found it nothing like the cycling I remembered, and nearly gave up. But luckily, returned it, got the money back and then added some more money to that to buy a Pashley from a decent bike shop (cos I live somewhere flat and wanted a steel bike) and not logn after would have been managing Sustrans route 65.
I know every winter I have stopped riding, only to start again in spring and have found that first ride back out is always agony. One year, I only got about a mile down the track and thought I was dying! Next time out, not so bad. Third time out, 20 odd miles no problem. It's weird like that. Every year I vow I won't stop in winter, so I don't have to regain my fitness...