"Like most people in our society, you might see the years from the age 30 onward as a slow, painful decline marked by the following outcomes: weight gain, fatigue, mysterious aches and pains, illnesses, memory issues, low libido, and sadness and anxiety. But contrary to popular belief, the real obstacle for most of us isn't age--it's loss of function. Our bodies are perfectly capable of remaining slim and vigorous, and our brains can absolutely stay...