As the guys have said only you can make that decision. As all of us get older our reaction times, strength and balance, etc. get slower to a point we may feel we're not safe anymore. I was going thru some of the same thoughts after my last accident. But my love of the open road kept me around. That and the fact that I'm on 3 wheels helped in that decision. Of course even being on 3 wheels is no guarantee you'll still be safe but I feel the odds are more in our favor then.
Good luck on your decision no matter what you decide.
Larry