I am only 33 and have started to experience my "faults" when I was younger I was doing many many stupid stuff like removing whole RWD transmissions with my chest and belly as its dolly - I was lifting extreme heavy stuff that have caused many internal scar tissue and the best of all is that my wrists click every now and then (that is also due to me depositing my balled fist into many materials)
So best be safe than sorry - Your body is given to you only once and while medicine has advanced substantially they still lag behind in bringing the human body back to "100% service spec"