Areas of the world and their population patterns

Today in class, we were shown a place in our country and their population according to age and gender. We saw how a city that has a big college has an influx of people from the age 18-26. This is because the majority of people there are students in college. We saw how a military bases population is mainly men because more men decide to go into the war. There was also a fair amount of kids at the base because many of the solider's significant others come along with them and live in housing on the base. Mr. Schick informed us that a military base isn't a bad place to start a family and in fact it's an overall good place to have children. We looked at a city and Florida and saw how many elderly people choose to retire there. I would not want to live in a place with that many old people, but thats just my opinion.