When we worked we stayed somewhat active, but during retirement, we need to maintain some activity to stay healthy, as D2 said.
Diet is also very important and sometimes serious consideration needs to take place, whether we should have some surgeries, or leave things as they are. Because our bodies are much older and much more difficult to heal, plus the medical procedure might make things worse.
For example, having knee problems and using a walker, to having unsuccessful knee surgeries and having to use a wheel chair.
Having saggy eye lids from eye surgery, to receiving forehead plastic surgery for lifting the eye lids, with an inexperience eye doctor[plastic surgeon] and making our vision much worse.
So sometimes leaving things as they are, is the best option, because we have no other choice to our bodies aging.