My brother Dave emailed today asking if I knew anything about Dr. Jeff Life (cool last name, eh?) and Cenegenics?
Take a click on that picture and watch the linked-to video to better see the ripped and buffed Dr. Jeff''s picks from age 57, and what he looks like now, at age 69. Twenty year olds could easily covet that bod. Amazing. Good for you, doc.
They don't give a lot of info, and I'm a bit unimpressed by the "find a physician" tack (as if hunter-gatherers needed physicians to express their genetic programming), so I don't have any idea of what consists their diet and exercise regimen. But they've got to be doing most of it right.
Diet: pre-agricultural, i.e., dump the grains, heavy carbs, and certainly all the stinky shit (that's a metaphor, to include the sweet smelling-stinky shit) they put in boxes and bottles.
Exercise: Brief, intense. All in, when you do it. An hour per week (2x30m) is sufficient.
Simulating scarcity: Hunter Gatherers didn't have grocery stores, for millions of years. Hunger is primal and motivational. Get intimate with it. Intermittent fasting.
Dr. Life is no aberration. See Clarence Bass at 70.
A hot body is your genetic birthright. All you have to do is create the circumstances under which your genes do what they evolved to do. They want to make you a winner. Let them.