Not many people wish to still be working when their 100th birthday rolls around, let alone celebrate it with office co-workers. Car salesman Derrell Alexander of Casper, Wyo. had not problem doing just that on March 17.

Alexander has been a salesman in Casper for 66 years and works six days a week at White's Mountain Motors in Casper.

"I don't have no hobbies," he told the Casper Journal. "I've worked all my life, so I don't know nothing else, I guess."

He added that he doesn't work on Sundays because "the bible says on the seventh day, you rest."

Alexander's daughter Sheri Rupe, who is retired, thinks that working is what has kept her dad such a sharp senior citizen.

"I think it's great; I think working is what's kept him going," Rupe said. "He'd probably be gone by now if he went home and sat down and did nothing."

When Alexander was at the top of his trade, he was one of the best salesman at the dealership. He won trips to Hawaii and Spain, among others, Rupe said of her father.

Alexander, who does not drive anymore because of vision issues, said that it was easier to sell cars before the Internet because people didn't do as much research. He still has no plans of calling it quits anytime soon though, saying he'll be at it "as long as I can get out of the house."

"You sit around the house and watch TV or something, and you don't last long," he added.