@EmilyQ : Flat out: the average american is NOT healthy. Not at age 18, not at age 30, and absolutely not at age 60. You are, by definition, exceptional if you are healthy. To be so at 60 makes you superb.
It’s too easy to hang out on Tnation, AMONG the exceptions, and consider yourself average, but perspective needs to be maintained here. The weakest link in our chain here is stronger than the mightest average person. And you’re far from our weakest link.