At age 56, i was forced to change occupations. I ran a foot-race with the grim reaper and beat him to the hospital by about 5 minutes, so i am told. Five days in ICU, 12 days on the cardiac ward, and an Implanted Cardiac Defibrilator, I had to change occupations.
I was an electrician and a SCADA tech, making just under $20/hr. After the problems, I could not get near live electrical circcuits or strong magnetic fields.
I applied at a number of places, got hired on at Home Depot in the electrical department, and am celebrating 10 years there this month.
A career change CAN be done if one wants to do it.