Ya, age 65 seems "normal" for the most part.
My dad retired at age 58/59 many years ago, he actually wanted to retire around 54/55. He was told that was considered early by the financial advisor. My dad asked what was considered 'normal', and back then they said 65, because it was based on when most of your government benefits (CPP, OAS, and GIS if applicable) would kick in without penalty. He was told he wouldn't get the full amount. My dad said if that's the reason, he didn't care to retire at the normal time. He was a business owner, so had minimal CPP (I think he might get a couple hundred a month now), and he would get a reduction for the OAS anyways because he immigrated to Canada as an adult.
He pretty much said, I don't care what normal is, he just wanted to know if he had enough money to do what he wanted. He had enough at 54/55 but did not retire because I was the wild card (and wild child) and was still in high school. He wasn't fully confident that I would launch or have to relaunch based on my teenage behaviors. He retired the year I got accepted into my facility and was pretty sure that was going to study to get through.
However, it was still considered 'early'. I think normal is based on that a majority of people require full government benefits for their retirement numbers. We just got our base financial retirement plan done, and they told us not to worry about CPP, OAS as it wasn't needed in our numbers, they also said that I could retire with a reduced pension at 55 as our other savings was more than enough.
I have a lot of collegues who make more than me, and say that can't afford any reduction and will go to the end until they get their full pensions.