Aging is inevitable — catastrophic decline is not

You're likely familiar with the cultural script on aging.It reads less like a list of life stages and more like a slow-motion obituary. Hit 50, and the back gives out. Hit 60, and the memory springs a leak. Hit 70, and sleep comes in seven installments, courtesy of the bladder. Hit 80, and people start congratulating you for standing up. Hit 90, and they congratulate you for waking up.Consistency, the least marketable word in wellness, turns out to be the key to thriving well past retirement age...