A handful of key dietary habits could significantly increase your lifespan. If you’re past the age of 40 and still eating like the young slip of a thing you used to be (before time, life and your 15-year college reunion), aging experts would like to have a word. While being in your 40s puts you clearly in what might be called “middle adulthood,” the specter of old age is looming on the horizon. The good news is that how you handle the next few decades can play a role in the type of old age you