mmigration and emigration make the most dramatic changes in the size of your population, especially early in the life of a city. I should mention, though, that there will be some natural fluctuation in population size due to births and deaths. The number of births is determined by the number of people of child-bearing age in your city. People are more likely to die as they get older, and not many live past the age of 50. Newborn babies must be housed, of course, and sometimes this will make someone else homeless, to make way in his old building for the new baby.

Your Population Advisor can show you a useful graph with details of how many people of each age there are in your city. Note that immigrants of all ages will move into your city, not simply all young people. The health of your people can also affect the natural changes in population; see Page 52, Sentiment, Mood and Crime for more information.