This lab is a simulation of a life form which commonly appears at Easter time, namely peeps. Little did you know that peeps live this idealized life on a small island far away, only to end up in packages for our consumption.
Peeps have the following characteristics.
They die on their 7th birthday. They mate for life at age 3. Each peep couple will have one offspring when they are 4 and 5 years old. If there is an odd number in that given year, the leftover peeps will never mate and will be an aunt or uncle to the offspring born to the other couples. The population is said to be stable if in two consecutive generations the umber of peeps in each age group is the same.