But by 2050, China's old-age ratio will have risen fourfold to 42, surpassing America's.
That means China's old-age dependency ratio (which compares the number of people over 65 with those aged 15 to 64) will soar.
Certainly productivity increases have softened the ill effects of this trend, but with some 77 million Baby Boomers at or approaching retirement age, the ratio will drop even more, to an estimated 2.1 workers for each retiree.
These others were chosen to match the study group's age profile, sex ratio and dwelling place.
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In France, for children under the age of four, the ratio is one to eight.
Between 2010 and 2050, the ratio of those age 65 and over as a share of the working age population will almost double.
The employment to population ratio of men age 16 to 64 fell by 10.3 percentage points between 1979 and 1983 (compared to 5.1 percentage points in the U.S.).
Accessible for free via iPhone and Android applications or the Web, SceneTap lets users view information on the number of people, male-female ratio, and average age breakdown of patrons in their favorite venues across their city.
But in the rest of the world, nothing appeals more than reporting on outliers in the ratio between net worth and age.
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This can be seen by comparing the median loan-to-value ratio of underwater borrowers by age, which is lower in the younger age brackets (see Figure 1).
Chicago-based startup revolutionizes the way people go out at night by automatically tracking and revealing the number of people in a bar, the male-to-female ratio, and the average age of each customer, in real-time, with no need for user participation.
The team also found and corrected for the facts that a mother's age and which province she lived in affected the sex ratio of her children.
Ms Banister points out that, in the 1953 census, the sex ratio at birth was more or less normal, but that at every age up to 14, girls were more likely to die than boys.
According to the Institute of Public Policy Research (IPPR), the current childcare ratio in England limits one child minder to looking after three children under the age of two.
Across Europe, the dependency ratio of older people (aged 65 and over) to those of working age (15-64) will double from one-to-four to one-to-two by 2050.
The figures are not strictly comparable, because sample surveys show the sex ratio at birth, whereas the census gives it among infants up to the age of six.
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