Until I read Dr. Lee Wei Ling today, I didn't know how important year wise the number 60 is. That is the age of very noticeable decline.
But some people don't seemed to be constrained at all after turning sixty. These are the lucky ones. I just saw S Gunalan on TV just now. He is old, fit and still running.
Someone left this as a comment to the above article. I thought it was quite helpful.