For instance, recent studies by the University of the West Indies (UWI, 1995), Griffith (2002) and Pacheco (2004) revealed that over 20% of the adult population (aged 15 and above) are illiterate and about 40% of the youth population (aged 15 to 24 years) are functionally illiterate.
Since then, the working population has aged, so the employment-to-population ratio will be persistently lower even in good times.
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The population aged 85 and older is also projected to double, to about 8.5 million.
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It is estimated that 4.9% of the Scottish population aged 16 and over are dependent on alcohol.
With 17% of the population aged 60 or older, Uruguay is the oldest country in the Western Hemisphere.
It is estimated at 32% of the population aged 10 and over according to the Moroccan Ministry of Education.
On the other side of the world, China's National Bureau of Statistics recently announced that the share of population aged between 15 and 60 years old declined for the first time in 2012.
Similarly, UNESCO noted that the net enrolment ratio (NER) in pre-primary education in 2005 for children aged 3 to 5 years was 46 per cent which suggest that well over half the pre-school aged population has no access to ECE.
About half the population is aged under 25, and the young will eventually insist on change.
Some 40% of the population is aged 14 and under.
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In many conflict-affected countries, over 60% of the population is aged under 25, but education systems are not providing youth with the skills they need to escape poverty, unemployment and the economic despair that often contributes to violent conflict.
According to AARP, U.S. Census Bureau projections show that the number of people aged 65 or older in the American population is expected to double in the next three decades, to about 70 million.
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According to the 2009 Census on Population and Housing, young people aged 10 to 30 years constitute approximately 40 per cent of the population of Viet Nam, representing an increasingly important proportion of the population.
Overall, the illiteracy rate in the young and middle-aged population group has fallen from over 80 per cent down to about 5 per cent.
In Cambodia, the 2008 National Population Census placed the literacy rate of those aged 15 years or older at 77.6%.
Ministers said that computer modelling shows that offering the checks to those aged 40 to 74 - approximately a third of the population - will save 2, 000 lives a year and prevent 9, 500 heart attacks and strokes.
Over the past century, the age profile of the population has become much older, with the proportion aged under 15 falling from 32% in 1911 to 16% last year, while the proportion aged 65 and over has increased from 5% to 17%.
Japan is currently the only nation in the world where people aged 60 or over represent more than 30% of the population.
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This agreement represents a significant expansion of the previously anticipated population of healthy adults aged 40 and over.
Meanwhile, the total working age population - those aged between 15 and 64 - will fall by 20m.
Within 10 years the number of people aged over 60 will pass one billion, a report by the UN Population Fund said.
They found that the rate of obesity among the women, who were aged 50 when the study took place, was higher than in the general population.
Although new home sales may have shown a small overall drop in February, builders expect the building of new homes for the nation's middle-aged and retired population to expand strongly.
The employment-to-population ratio for people aged 20 to 24 has fallen to 60.1% from 67.1% over the past three years.
More than half of Iran's population is aged under 25 and the BBC's Gavin Hewitt said this younger, internet-savvy generation was rocking the centre of power.
People aged over 55 now make up 17% of the UK internet population, a survey for consumer magazine Which?
By 2035 it is projected that those aged 65 and over will account for 23% of the total population, up from 15% in 1985.
Male pensioners aged 65 in the small Somerset village of Hinton St George, population 400, have the highest life expectancy in the UK, at 88.7 years.
For men aged between 65 and 69, the mortality risk for the wealthiest decile of the population is 40% lower than the risk for the poorest decile.
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