I started when I was 6.
I don't remember when we started riding through the mountains together as a family on vacations, but I was young. We also did some fairly lengthy weekend rides. I might have been 9 or 10 when we started all that.
I took about 3 years off the bicycle between about 19 and 22, only riding a few times a year in that time period, but otherwise ... I've been riding since I was 6.
35 years and counting.