I started as a mechanic, before we were called technicians, years ago and it was back breaking work. While it can still be ha*rd on the body, the physical strain is not as much. Now much better design in lifts and creepers and over engine creepers and removal equipment and less all round "get dirty" work, with module replacements and not rebuilding components in the shop. At 70 years old, I still do so much of my own work but if requires major effort under the vehicle or pulling a transmission or engine, I don't do it. If I had a lift and the proper under carriage support tools, I would do more. I feel like, as long as I have the desire to do the work, I will. Do I think I could do it for 8 hours a day, 5 days a week for 52 weeks a year? Depends on if I specialized in a certain area on the vehicle.
When I got out of the service, the local Ford Plant in Claycomo, Mo., north of the river in KC, Mo., offered me and other vets jobs but I turned it down. Did not want to do the same repetitive work day after day. My youngest brother has worked there now for close to 30+ years. He will retire from there within the next 5 years. Give me shop work any day, where every vehicle is a different challenge, instead of that repetition.