The average household size was 2.93 and the average family size was 3.32. In the city, the population was spread out with 32.7% under the age of 18, 11.9% from 18 to 24, 22.7% from 25 to 44, 14.4% from 45 to 64, and 18.3% who were 65 years of age or older. The median age was 32 years. For every 100 females, there were 93.1 males. For every 100 females age 18 and over, there were 101.1 males. The median income for a household in the city was $36,786, and the median income for a family was $41,667. Males had a median income of $26,705 versus $21,750 for females. The per capita income for the city was $12,497. About 4.8% of families and 8.3% of the population were below the poverty line, including none of those under the age of eighteen and 41.7% of those sixty five or over. Martin is the home to a large bikers gathering every summer sponsored by Doochie's Bad Company Bar. It occurs every July. It is also the home city of the St. Martin Martins amateur baseball team. The Martins have become a state tournament regular in recent years—returning nearly every year. The Martins recently added lights to their baseball field, allowing them to play at night. Martin was the setting for "The Chicken Doesn't Skate", a children's novel by Canadian author Gordon Korman, in which a sixth-grade nerd is transplanted there from Los Angeles.