Well, we've seen research moving in this direction for nearly ten years now, since the first observations that lead to research on ultra-low calorie diets extending life span. The theory was, at first, that perhaps humans only had a certain number of calories to burn over the course of a lifetime. The idea that flavinoids, and eventually, resveratrol, could serve as a way to simulate the life-extending benefits of a very low calorie diet was subsequently demonstrated in a number of studies.
And now, we have a safe and simple test to give an indication of the rate at which one is aging. Now, whether a person wants to know or not...
The £400 test that tells you how long you'll live - Science, News - The Independent