According to the 2011 Canadian Census, the population of Ajax is 109,600, a 21.6% increase from 2006, which is approximately four times faster growth than Canada as a whole. Ajax's land mass is 67.07 km2 with a population density is 1,634.2 people per km2 and it has approximately 35,040 occupied private dwellings. The median age is 36.2 years old which is more than 4 years younger than the national average at 40.6 years old; of the population is under 15 years of age while are 65 and over.