As a mechanic, you have no concept of how much wear and tear your body takes after years of driving some POS.
To an extent, I'll agree. I haven't had the fortune of driving the older high step, POS cars that many of the older guys have had to drive and tear up their body's. There are quite a few older guys in the center I work in with several knee operations, arthritic hips & knees, bad backs, dozens of sprained ankles that are now taking their tolls on their aging body's.
With that said, personally, I've had 2 arthroscopic surgeries on left knee, 3 on the right, next operation on right will be joint replacement. Cotizone shots keep me going. Then the corpal tunnel is always reminding me why I even decided to turn wrenches for a living. The arthritis in my neck keeps me mindful of a broken neck in 94'.
In all honest, it isn't just the drivers that are feeling the fruits of our labor. Mechanics feel it too. It's just the nature of the beast. Sooner or later the body will break down after years of abuse.
Far as the older cars with high steps, those days are numbered. same as the manual tranny's. For the most part the high steppers should evenually be gone in the next 5 to 7 yrs. the manual tranny's should be gone by 2020, hopefully, if not sooner.
****Not looking forward to retirement when I zoom around in my high octane wheelchair.