Demographics, the study of populations

Pop! @ artspace shreveport
Originally uploaded by trudeau

Demographics are the characteristics of a human population as used in government, marketing or opinion research, or the demographic profiles used in such research.

Commonly used demographics include
gender,
race,
age,
income,
disabilities,
mobility (in terms of travel time to work or number of vehicles available),
educational attainment,
home ownership,
employment status, and even
location.

Therefore my observational demographic profile of the group
in the photo -
50% female, 99% white, median age 32, income 40,000, mobility 100%, education: college degree, home owners 40%, 70% employed,
90% East Shreveport.

Notable demographics:
- The US "baby boom" generation was unusually populous.
- Impoverished nations: the people tend to have large families so that the children help support the family income. These nations cannot afford a welfare or social security system. The children are expected to aid the parents in time of illness or in advanced age.
- wealthy nations: the people tend to have the smallest number of children.

From Wikipedia:

Japan has one of the highest life expectancy rates in the world, at 81.25 years of age as of 2006.[122] The Japanese population is rapidly aging, the effect of a post-war baby boom followed by a decrease in births in the latter part of the twentieth century.

The changes in the demographic structure have created a number of social issues, particularly a potential decline in the workforce population and increases in the cost of social security benefits such as the public pension plan. Many Japanese youth are increasingly preferring not to marry or have families as adults.[124] Japan's population is expected to drop to 100 million by 2050 and to 64 million by 2100.[123] Demographers and government planners are currently in a heated debate over how to cope with this problem.