I started at 57. Third season and I am 59. I do not regret going into business. Though there has been growth every year. The growth has been slow. I do not have a full schedule.
Some people have been lucky and they get more work then they can handle solo after 1 or 2 years after starting out. So not to discourage you but to make you aware. They say most businesses take 3 years to take off.