Those numbers are expected to jump as the baby boomer generation ages, overall life expectancy increases, and medical advances make it possible for more babies to survive premature birth.

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Mostly, New York City's growth is due to a widening gap between the numbers of births and deaths as life expectancy increases, according to city planners' analysis of the census estimates.

WSJ: More move in than out of NYC; 1st time in decades

As life expectancy increases, so do the number of people with neurological disorders: today, about one in eight Americans aged 65 and over has Alzheimer's, and nearly half of the people aged 85 and older.

BBC: Magazine

Give the devices to seven-year-olds who stay on devices through high school and chances are quite high that they would use only Apple products for the next 50-70 years, unless life expectancy increases along the way.

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It is a paradox that, in spite of dramatic increases in life expectancy and improvements in health in the developed world over recent decades, as a society we are obsessively preoccupied with the specter of hazards lurking in our environment and consumer products.

FORBES: How Activism Distorts The Assessment Of Health Risks

Nowhere is the importance of innovation more apparent than in quickly-changing contexts like that of Bangladesh: many villagers are migrating to cities and abroad, women are increasingly entering the workforce, there is a youth bulge, while with increases in life expectancy, the fastest growing demographic is senior citizens.

FORBES: 3 Messages from BRAC's Frugal Innovation Forum for the Skoll World Forum