Terrified of losing your mind when you get old? Maybe you won’t. A new Danish study of two large groups of people in their 90s show that people born in 1915 both lived longer and had less mental decline than those born a decade earlier. Researchers even adjusted for expanded education since the early 20th century and found that those they studied still showed significant improvement, suggesting that better nutrition, decline of diseases, and living conditions have improved cognitive functioning. The study”s authors said their findings contradict the conventional wisdom that people now living to advanced ages are mostly doing so with feeble health and mental ability.