Age Distribution Pyramids

Human Population of Class 12

Age Distribution Pyramids

3 age groups are selected for constructing age pyramids:

  • Pre-reproductive age (0 –14 years)
  • Reproductive age (15 –60 years)
  • Post reproductive age (> 60 years)

There are 3 - types of pyramids

  • Triangular
  • Bell-shaped
  • Urn-shaped

Triangular Pyramid - indicates expanding population with high growth rate
Bell-shaped Pyramid - indicates stable population with zero growth rate.
Urn-shaped Pyramid - indicates declining population with negative growth rate.

Age Distribution Pyramids

(A) Triangular pyramid  

(B) Bell-shaped pyramid 

(C) Urn shaped pyramid

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