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Age-structure diagrams show the age and gender groups in a population. This allows demographers to predict the future population growth by determining the percentage of the female population. Since females are able to reproduce, demographers can predict the birth rate in the future.

Thus, we can conclude that open clusters are young (usually a few tens of millions or hundreds of millions of years old), while globular clusters are very old (typically about 12-13 billion years old).

There are generally three types of population pyramids created from age-sex distributions-- expansive, constrictive and stationary.

Globular clusters in the Milky Way Galaxy prove to be nearly as old as the universe, averaging perhaps 14 billion years in age and ranging between approximately 12 billion and 16 billion years, although these figures continue to be revised.

Population growth rates can be interpreted from age structure diagrams by the shape of the structure.

A population pyramid, also called an age structure diagram or an age-sex pyramid, is a graphical illustration - typically in the shape a pyramid - which depicts the distribution of various age groups for each gender in a geographical area such as the European Union, a country or a region.

One of the tools that demographers use to understand population is the age structure diagram (it is sometimes called a population pyramid, but it is not always pyramidal in shape). This diagram shows the distribution by ages of females and males within a certain population in graphic form.

Age structure: The composition of a population in terms of the proportions of individuals of different ages; represented as a bar graph with younger ages at the bottom and males and females on either side.

Globular clusters ? which are round, symmetrical clusters containing hundreds of thousands to millions of stars ? were thought to be around 13 billion years old, nearly as old as the universe itself.

Globulars are ancient stars The stars in globular clusters are the galaxy's most ancient inhabitants, comprising a population of what astronomers call Population II stars. Their estimated ages are between 11 and 13 billion years old, making them almost as old as the galaxy itself.