Two years ago I talked a good friend of mine into applying at my agency. He was 42 at the time, and had just sold his business. His background is in finance. He was basically being a ski bum when he applied, and was picked up. He loved the job, and excelled at it. He left after a year because he was offered a CFO job in a division of a Fortune 500 company, making mid 6 figures. I don't mean $150,000; I mean half way between $100k and $1M. It's funny, he wasn't looking for a job at the time, a recruiter picked him up off Linkedin. He took the initial phone interviews from his patrol car.
I told him not to leave, since he hates corporate life, but the money got to him. Also, my agency has a decent retirement, 2.4% per year at 57. He could have retired at 57 with full medical and dental with 36% of his final pay. Basically, he could be done working at 57, while now he'll have to keep working until 65 (when Medicare kicks in).
Fast forward a year, and he's missing police work. He just started the process to become a reserve officer at my dept. My guess is that in a year he'll be back, full time.
Another guy I know was a reserve at my dept for many years. At age 50 he was laid off from his corporate sales job and went full time at my agency. He was an excellent cop, and did it for 15 years, retiring at 65. But he was a super fit guy, the kind of guy who ran half marathons at age 50, so he had no trouble with the physicality.
If you're interested, do it. If you don't like it, you can quit.
My main concern is that you're currently out of work. It will take 3-6 months, minimum, to finish the hiring process. What do you have lined up in the meantime?