There are several different ways to measure age. The simplest is to count the years. But we all know that your chronological age doesn’t tell the whole story. There are 56 year olds who look like they are 40 and there are other who look like they are 70. The best test of aging today appears to be a test of telomere length. As it turns out, our telomeres, the caps on the ends of the DNA strands that instruct the cells to divide can be used to give us a sense of our biological age. Another way to measure age is to look at your vascular reactivity. The greater the flexibility and thus reactivity, the younger you likely are.