The criteria for healthy aging shift towards different physiological goals than those for growth phases.

“when you're growing hormones are your friend they're sort of driving it and you look at malnutrition in Africa and children will grow on really lousy diets they may not grow as healthy they may not live as is long but there's a survival reproduction nature to that uh now we switch to talking about healthy aging and I want to live to where my parents you know I want to get to that century mark now we talk about healthy aging and now we sort of change the uh we change the criteria that we're looking for”