I decided to become a (volunteer [0]) firefighter at 60 (software development background). It has been awesome.

Last year, I considered becoming an "EMR" (Emergency Medical Responder) - the lowest level of certification for emergency medical care that there is (basically, you can get vitals and stats from the patient if they are conscious). Because of timing considerations, I ended up not doing the course.

A year later, I see my 2 fellow firefighters who did become EMR's having to 20+ hours a year of mandatory continuing ed/training to their lives, and I'm pretty glad I ended up not doing that.

The firefighter part, given that we're a small, very not-busy volunteer rural fire district with an awesome district chief and culture, continues to be fantastic.

[0] thanks to the unions in my county fire department, volunteers are required to go through all the same certifications as career firefighters. We lack their level of experience (mostly) because we don't go on as many calls.