Well I’m in my 50s, but honestly, I feel like I’m still young. At what age should I get serious about my health?

Right now would be a good start. Longevity researchers study a phenomenon known as future time perspective. The more time we perceive we have, the more we’re able to ignore the fact that we’re overweight, may have elevated inflammation levels and don’t know what our basic health numbers look like. If you haven’t had a checkup in the past year, start there. Get your blood pressure, blood glucose and cholesterol numbers checked, and make sure that keeping them under control is a top priority.