Other than COVID-19 prophylaxis, I don't think I've changed much about managing my health. At 67, I try to balance what I want to do against what I shouldn't do. For example, I'm more careful about what I eat than I was, say, 10 years ago. I also cut myself lots more slack than I used to when I'm feeling sick or sore.
To me, aging is mostly about dealing with loss -- of friends, family, and function. It's an ongoing struggle between accepting changes and carrying on as before. Finding a workable middle ground is a big part of staying healthy.