In general, in most regions of Canada there are more females than males and this trend is particularly evident in areas with higher proportions of the population who are elderly. The preponderance of females in the older age groups is due to their higher life expectancy compared to males. In 2006, Saskatchewan had the highest proportion (17.1%) of the female population that was 65 years and over, while Alberta (11.9%), and the three territories (7.2% for Yukon, 4.9% for the Northwest Territories, and 2.6% for Nunavut) had the lowest proportions. The map shows the sex composition by age of the population by census division.