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An age structure diagram is a model that predicts the population growth rate by a shape. It shows a comparative ratio of males to females and the bars show various age groups from infants - adolescents - reproduce - post-reproductive.

Interpreting a Population Pyramid A wide base suggests high birth rate. Narrow base shows low birth rate as small numbers of children are born.A broad top or wide apex indicates high proportion of people living longer. Straight or near vertical sides depicts a low death rate.

If the diagram shows a generally straight up and down shape except for the older age groups, a stable population is thus revealed. If the diagram shows a top-heavy shape, then a decline is forecast for that population.

An age-structure diagram provides a snapshot of the current population and can represent information about the past and give potential clues about future problems. When you are interpreting age-structure diagrams, it is important to compare the width of the base to the rest of the population.

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.

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.

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.