Different organizations tend to have a bit of variation as to whether to start at 40 or 45. Even some organizations in the U.S., such as the ACS, recommend age 45. We have some provinces in Canada that recommend 45 and above too, so there's a bit of variation. However, overall, if you look at all the evidence that is currently available, it is a best practice to start screening at 40, and that's what we are pushing for.
On June 13th, 2024. See this statement in context.