64, top speed so far 41.3 MPH going downhill, class One, only one crash so far (about 800 miles on one bike and 200 on the other) on Hell Hill a few months ago, but I was pretty much expecting it, laid it down pretty soft and rolled. No injury.
I totally understand wanting to quit after a crash, but also recommend continuing if your doc and fam are okay with it. Just be sure to pay attention, and yeah-- even looking at the controller can be perilous. I am learning to ask myself, "Do I really need to check my range/speed/assistance level right now, or can I wait 10-30 seconds until I'm someplace where it's absolutely 100% safe?"
Body boarding is far more dangerous, at least now, at my home break. I have bilateral rotator cuff tears, left is a lot worse, and PT says that it could be from a wipeout in November. Everyone in the lineup is saying the last three years at this spot have been the worst in a quarter century-- really fiendish and deceptive, tiny two to three foot waves are utterly predictable for four or five in a row, then the sixth one (which looks exactly like all the others, we've all compared notes, and you canNOT predict these closeouts in advance) rears up to four feet, slams you into the water two or three times before knocking you off the board and holding you under for about 30 seconds. (I did go back the next week on a smaller day to finish the season without incident. If I had not, I'm sure I would have stopped for good.)
We'll see what PT says in a couple of months, but I'm thinking I'll either stop or impose a 2-foot limit, try to stay at it another couple of seasons.
I rarely crash on two wheels, though of course in some spots if I did, the consequences could be far worse. There are some new washouts on one of my favorite trails... and last week, I was staring at it and... yup, target fixation, I turned straight towards it! Veered back, wobbled a little bit, but no crash.
PT says eMTB should be good for many years as long as I'm careful and don't do anything more intense than what I'm already doing.