Richard Keith – 68

Richard Keith, who portrayed Little Ricky on the ’50s sitcom I Love Lucy and The Lucy-Desi Comedy Hour special, is the last living regular cast member from the show. Interestingly, when he first landed the role, his last name was changed to Keith by Desi Arnaz because his real surname was considered too hard to pronounce. Keith, the former child actor and musician, is now 68. He was part of a rock band called David and the Giants but left the band due to his problems with drugs. The band reunited later and released nearly ten albums.