Find Out Your "Fitness Age" by Answering Five QuestionsS  How
well does your body really function relative to your actual age?
Researchers have figured out a way you can find out—without
having to go through extensive physical stress tests. In fact,
all you need to do is plug in your numbers into their
calculator.  To create the fitness age calculator, the
scientists from the Norwegian University of Science and
Technology conducted an extensive test measuring 5,000 Norwegian
volunteers between the ages of 20 and 90. They measured height,
body mass index, cholesterol levels, and the like and made each
volunteer run to the point of exhaustion on a treadmill to
measure the volunteers' peak oxygen intake (VO2 max). The VO2
max, or how well the body delivers oxygen to your cells, has
been closely associated with longer lifespans, and thus might
indicate fitness age.  In the end, it turns out just five
measurements—your age, gender, waist circumference, resting
heart rate, and exercise habits—can accurately predict