Most of my adult life crashing has been while mountain biking when exceeding the limit of my ability (running out of talent). But I think it was in my childhood days when I learnt how to minimise crash damage. Biking, skateboarding, skiing, trampolining and generally hooning around with little personal responsibility. I think that's when you learn these instinctive "crash" responses that may come in handy in later life.
Now in my 50s I run a strict zero crash policy. No risks riding above and beyond my modest ability. Touch-wood I haven't crashed on a bike in the last decade and don't plan on starting again any time soon. Practicing crashing is not really very practical. I'm not sure thinking about crashing has much merit at this point either?