Is aging a disease? Some experts say it should be treated that way, and pricey 'longevity clinics' agree

Age-defying treatments approach the issue at the cellular level with the promise of extending life. But they’re not cheap. Trying to slow down or reverse the effects of aging is nothing new. Whether it’s taking a good old-fashioned walk in the park or injecting your furrowed brow with chemicals to freeze your face, attempts to hold onto youth can vary from the everyday to the extreme. And now, aging isn’t just viewed as a normal part of life. It’s being looked at like a “disease.” An...