He's arguably the last of his kind from the Golden Age of stand-up comedy. Don Rickles is now 90 years old and still performing, though according to a profile in the Washington Post, he's now considered a sit-down comedian, with a recliner on stage being about the only concession he's made to his advanced age and the onset of some physical infirmities. But his razor-sharp humor remains intact and Rickles still writes his own material to perform in front of appreciative audiences. Most people would be uncomfortable with being singled out by a snarky comedian but Rickles' fans consider it be a mark of honor to be on the receiving end of his insults. There was a time when Rickles broke barriers with his unique act in the 1960s. Until then, most stand-up comics were relatively benign and respectful to their audiences. Rickles changed all of that. A downside of his influence is that, while Rickles gentle ribbing never crossed the line into vulgarity, the younger generation of comedians had no such reservations. Perhaps because his act reminds us of a gentler time in American comedy, Rickles is now considered to be a national treasure. It's worth noting that he is also an accomplished actor, having appeared in dramatic roles in feature films in such diverse fare as Roger Corman's "X: The Man With X-Ray Eyes", "Run Silent, Run Deep" opposite the likes of Clark Gable and Burt Lancaster and "The Rat Race" with Tony Curtis and Debbie Reynolds. After Rickles caught on with his comedy shtick, he remained a popular fixture in feature films, often replicating his wiseguy persona, most memorably in the Clint Eastwood WWII comedy caper film "Kelly's Heroes". He also provided the voice of the grumpy Mr. Potato Head in the "Toy Story" films and reverted back to a dramatic role in Martin Scorsese's "Casino". In 2007, director John Landis paid homage to Rickles, who he met as an aspiring filmmaker on the set of "Kelly's Heroes", with the acclaimed documentary "Mr. Warmth: The Don Rickles Project". Click here for an interview with Rickles and clips of some of his best moments.