Population aging In recent decades the population of the developed world (and much of the developing world)has been aging. Between 1950 and 2050: Average age worldwide will increase from 25 to 35 Ratio of infants(under 5)to elderly (over 65)will flip from 5:2 to 2:5! Bhattacharya,Hyde and Tu-HealthEconomicsBhattacharya, Hyde and Tu – Health Economics Population aging • In recent decades the population of the developed world (and much of the developing world) has been aging. • Between 1950 and 2050: • Average age worldwide will increase from 25 to 35 • Ratio of infants (under 5) to elderly (over 65) will flip from 5:2 to 2:5!