T-bones by a lady motorist coming out of a junction on a minor road as I was passing ("my foot slipped') about 30 years ago. I've been carrying a minor knee 'niggle' ever since.
OTOH, I've been into the back of a couple of cars. Once when I was about 12 whilst mulling over a 'domestic'. I hit the rear window with a satisfying thud and completely wrote off my bike which was a financial disaster. I went home with blood pouring down my face and wailing, 'my bike, my bike', and a couple of years back I was hauling my way up a hill absent mindedly, rounded a bend and bounced off a landrover stopped at a temporary traffic light, completely writing of the frame (my bike, thatis, not the landranger's. Oops.
Best guess to the rather complicated question is >50k miles, i.e., most of my adult life was incident free.