I'll try and estimate the mile thing....
1984-1992, est average 500 miles a year (wasn't really into it then)
1992, So after 4000 miles, hit and run on roundabout at end of Marston Road Oxford, bike written off (a Raleigh 531 with el cheapo bits to get me to pub and back), car driver sped off, I had to walk home carrying my wrecked bike. On the plus side I bought a decent bike and got more into cycling.
1992-1995, est average 2000 miles a year
1996-1999, long commute + bike computer, so notched 6000 miles per year
1999, 24,000 miles - drink driver hit me head on in Cape Town at 6pm, he was on the wrong side of the road. Landed on the bonnet, helmet broke in half. Other than bent forks and destroyed wheel bike seemed OK. Drink driving was very common, and police would not have been interested (!), and as driver was apologetic and offered to pay for damage wasn't much I could do. But frame was cracked in impact and failed a couple of years later (was told that bike was beyond repair at local bike shop). It was a 90s Trek 920 MTB, one of the best bikes I ever had :-(