Keeping yourself looking young and energetic owes far less to creams and supplements than the ads suggest: the biggest, best-proven levers are unglamorous, chiefly protecting your skin from the sun and getting enough sleep, both of which show up plainly in the face

There is an enormous industry built around looking young and staying energetic, and almost all of it wants to sell you something: a cream, a serum, a powder, a subscription. The evidence points somewhere much cheaper and much duller. The habits that most reli…