Okla. I know of no employment service that does not work with people over 55. However, you seem to need some help with the burnout. You may need to pamper yourself in other ways first. I am considering becoming a personal trainer. Minn. It is a growing field, but it is difficult to start building a clientele on your own.
Most personal trainers start by being employed by health and wellness establishments.
After you are a known entity, it is much easier to develop a client base. Talk to people in the field to get the pros and cons of the occupation. I'm a chemical engineer. I really enjoy going out on the road and traveling for weeks at a time. When I get back to the office I feel useless and leaden.