PIP: It is easy to build the population pyramids which demographers use to represent the age and sex distribution of a particular population at a specific point in time. With relatively high fertility, the population distribution in most developing countries conforms to the classic pyramid shape. Some developed countries, however, are beginning to show pillar-like shapes, while graphs for selected population subgroups may be considerably different. An inverted pyramid graph is used to illustrate the population distribution of Sun City, Arizona, with the largest population age group being over 79 years old. Instructions are given on how to create population pyramids using Microsoft Excel, a commonly available spreadsheet software program. Population pyramids can also be generated using Population Pyramids 98, a software utility from HPN Technologies, Inc.