I'll be 44 in August. I can tell quite a difference in myself in the past 5 years. I know there's more coming too....
So far, with car/engine stuff, aside from the normal nicks/scratches, I had to get 4 stitches in my thumb from a sharp edge on a BBF connecting rod. Also cut a piece of duct tape off of an aluminum bar and managed somehow to sever a tendon in my left pointer finger. Required surgery.
My biggest issue has been my back though. Two years ago, I was afraid I was going to have to quit building engines. I'm 5'6" and about 140 lbs on a good day, but used to pick engine blocks up off the floor by myself. In May of 2019, I picked a 302 block up to put it on an engine stand. A few days later I noticed a nervy pain in my hip. Went to a chiropractor who proceeded to "adjust" me without taking X-rays or an MRI. Apparently I had a small disc herniation on L5S1, but after a few days of his "adjustments", it became a 12mm protrusion and that's the worst pain I've ever been in. Finally begged him for an MRI. When we found out what it was, I ditched him and started seeing a physical therapist who specialized in spine injuries. Took 12 weeks of physical therapy to get it under control.
As of right now, I still feel it down my leg when I pick up an FE crank to set it in a block, but I can move around pretty good. I do daily exercises to control the herniation.