Ruth Goldberg Jaskow does an exercise class every day at 101 years old. She wants to live longer than her husband, who died aged 103.Atria Rye BrookRuth Goldberg Jaskow is 101 and does fitness classes every day.She shared her tips for staying happy and healthy into your 100s with Business Insider.These include staying active and eating what you like.101-year-old Ruth Goldberg Jaskow has an unusual fitness goal: she wants to live to 103 to "beat" her husband.Goldberg Jaskow, who lives in New York City and worked as a teacher, has always been determined — when she was younger, her family gave her the nickname "Wouldn't Budge."She was married to Lou Jaskow, a sailor who served in World War II, from 1943 until he died in 2023.Although she believes that "age is just a number," Goldberg Jaskow now wants to stay fit to live longer than her husband.Centenarians' longevity is partly determined by genetics and luck, but lifestyle factors also play a role.