Health can't be replaced.

It is true (and important) in a sense that it's better to take preventive actions than to react to symptoms. But unlike time, health can be improved in some cases even after it has deteriorated. Time can only be managed, you can't get it back.

I don't find myself as energic as I was in the past and it just sucks to grow older. I do think that getting some exercise goes a long way though and I felt better after that.

Better/different food helps with that too. But too few people focus on that, and if they do, find the best combination for them.