If you could prolong your life by a few more years (or even live to be 100), would you do it? I can't think of many people who would say no.

I've devoted my entire career to geriatrics, a field that specializes in the care of older adults. I helped start one of the first geriatrics programs in the U.S. at Harvard Medical School, and I'm currently a professor of medicine and public health at Brown University.