by Melanie Pinola – LifeHacker.com
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 5000 Norwegian volunteers between the ages of 20 and 90.