Revealing his secret to longevity, the inspirational father-of-two said anyone could do it... unless "you sit around the house and watch TV" An incredible 100-year-old man celebrated his birthday at the car dealership where he still works - 66 years after making his first sale. Derrell Alexander, from Wyoming in the US, loves working at White's Mountain Motors, so much so that he refuses to retire and works an impressive six days a week.