To avoid cognitive decline, you only need money, time, good relationships, health insurance, plenty of sleep… — I adore Dr. Sanjay Gupta — he’s a neurosurgeon, journalist, CNN’s Chief Medical Correspondent, and a handsome, funny guy. His newest book, Keep Sharp: Build a Better Brain at Any Age, is a must-read to understanding how the things we do today will impact our dementia risk later in life…