First time on a horse probably around 3 or 4, a fairground thing. Hooked. Lucky enough to have weekly lessons at a local school until I was 13 or 14 - I spent lots of days hanging round the stables helping and so sometimes participated in longer day events as a return for that. When I was 13 I rode a pony for a family whose son - the owner - was away at boarding school. I groomed and did stable work for another family with a few horses.
Then, at 16, I discovered motorbikes
I still rode occasionally between then and going to uni, but less. During uni I was racing motorbikes so had no money left for anything, but I groomed for a livery stable as one of my many part-time jobs and rode from time to time if someone needed their horse exercised.
Then after uni, I started working abroad and with no fixed base, it's been a largely horse-free zone until last year, so a gap of nearly ten years. I rode when I got the chance - I've ridden some lovely Arabs in Chad, and in Somalia, and a couple of imported warmbloods in Kinshasa. Here in Afghanistan I am supposed to be going to see some buzkashi horses - that's the game a bit like polo only without mallets, and with a headless goat/calf instead of a ball... - next week. I'm quite excited!