I'm turning 63 rather soon. I don't want to be doing this when I'm 63 - at least, not full time. I don't have the concentration to keep pushing my brain throu

I'm turning 63 rather soon. I don't want to be doing this when I'm 63 - at least, not full time. I don't have the concentration to keep pushing my brain through a concrete wall for 8 hours a day, day after day.