How can some centenarians lead unhealthy lives?

You'd think that centenarians -- people age 100 and older -- would owe their longevity to healthy habits, but that's not always the case. Tune in to this podcast from HowStuffWorks.com to learn more about genes, longevity and unhealthy habits. Learn more about your ad-choices at https://www.iheartpodcastnetwork.com