In his new documentary, director Mark Wexler embarks on a worldwide trek to investigate just what it means to grow old and what it could mean to really live forever. But whose advice should he take? Does 94-year-old exercise guru Jack LaLanne have all the answers, or does Buster, a 101-year-old chain-smoking, beer-drinking marathoner?
How to live forever
Science St. Paul, Minn. ·