Medical researcher David Sinclair demystifies aging, revealing its singular cause and showing how we can use that knowledge to extend the human lifespan.

For the entire history of our species, we have accepted frailty and deteriorating health as just part and parcel of aging. But what if it didn't have to be that way?

What if we could live well into our 90s and 100s, maybe even 120s, while still being physically and mentally active?

For David Sinclair, professor of Genetics and co-director of the Center for Biology of Aging Research at the Harvard Medical School, the question of aging is not just hypothetical.

Sinclair believes that with current advances in medical technology, slowing aging and extending the human lifespan is fully within the realm of possibility for today's younger generations.

In his first book, Lifespan – Why We Age and Why We Don't Have To, the author explains common misconceptions about aging, and how science can help us combat it.