i'm your host, mark larson. thank you for tuning in. great show planned for you today, but if you're like most people, you may have noticed that when you hit age 50, you kind of hit the wall. whether it's your joints, your heart health, your brain, your eyes, or your energy levels, when you hit the big 5-0, you really have to start paying attention to your health. well, our guest today says he's discovered a vital key to promoting your health at any age. so, what is it? well, stay tuned. dr. neil levin is here, and