I'm seriously considering another career. At my age I have just enough time. I desire a change in my work dynamic. I have prayed on this and at the point where I must make a move in a more positive direction.
You are never too late to start anew. Colonel Sanders was in his 70's (?) when he started KFC, and Grandma Moses was in her eighties when she started painting and Georgia O'Keefe was active very late in life. (80's and 90's, I think.)
So, God willing, you could possibly have another 20 to 30 years of productivity. If you act like it is possible, it is more likely to happen.
BTW, what career are you considering, brain surgeon, extreme athlete, gardener, POTUS?