For the record I'm 72. Two weeks ago I went to my cardiologist for my once a year, "evaluation", after taking a slew of yearly tests. He told, and showed me that all of my results, EKG, Ultrasound, blood pressure, cholesterol, Echocardiogram, etc. were all excellent.
We talked a bit, and I asked him how I stacked up, compared to many of his other patients, on a, "1 to 10 scale". He laughed and gave me a "10". He said, "I've got 30 and 40 year olds under my care that are in far worse shape than you. I sometimes wonder if they'll make it to their next exam".
The bottom line, using age to gauge one's overall health, is a bit like saying everyone that doesn't go to church is dishonest. Especially today when so many young people lack exercise, and have so much processed crap in their diet.
One of the biggest health issues facing today's youth is obesity. I see it every time I drive by the school bus stop in the morning on my way to town. Half the kids there are vastly overweight, and should be walking to school.
Diabetes is a major issue in the health of today's youth. It is increasing in record numbers. My guess is the overall health of people in this country, (especially the youth), is going to get far worse, before it gets any better.
The increase in life expectancy today, is mostly due to the advances in new drugs, along with modern medical procedures. For example, many cancers and cardiovascular problems today are treatable, that not long ago were basically a death sentence. This in spite of poor diet, lousy food, along with the lack of any exercise trying to drag it down.