In Canada in 2010, the age classes that contained the largest number of people were those in the age range of 40 to 44 years old and 45 to 49 years old. According to the data from Statistics Canada, in 2010, there were approximately 4.3 million people aged 40 to 44 years old, and 4.1 million people aged 45 to 49 years old in Canada. These age groups had the largest number of people because they represent the cohort born during the post-World War II baby boom, which occurred from 1946 to 1965. This group is often referred to as the baby boomer generation and has had a significant impact on Canadian society and the economy.