I turn 63 in a couple of weeks and have some of the ailments the others mentioned; Arthritis, bad knees, bad back and I have had a pacemaker since 2002. A couple of years ago I was upgraded to an implanted defibrillator. No issues with that yet and I do most of my own work on my cars.
Last visit with my cardiologist she ran the diagnostics (with a T4 sort of computer) and told me I had had an arrhythmia episode on March 8th. Curious as to what I did that day I checked the dates on the pictures in my phone and what did I see...Pictures of my changing the gearbox on my MGF!
So, last month I changed the clutch on my ZT190 but for the first time ever I paid someone else to do it for me. No sense taking chances!
I am still doing everything that doesn't involve heavy lifting though.
(Also, no welding
)