Dan Levitt: Who wants to live to 100?

Tonight Show host Johnny Carson once asked his 99-year-old guest, comedian and cigar aficionado George Burns, “Who would want to live to be 100?” Without missing a beat, the nonagenarian about to become a centenarian replied, “Someone who is 99!” The live studio audience erupted in laughter.
Burns famously smoked cigars and shined a spotlight on the mystery of aging, that there is no magic pill or prescriptive lifestyle that guarantees longevity. There are many paths to 1