I have a few figures that might be worthwhile to look at.
According to the labour force survey of Statistics Canada, a decade ago about 200,000 seniors were employed. Today it's over half a million. For young seniors, those age 65 to 69, it's even more pronounced; their employment rate has increased from 11% to about 23%. For women, the employment gains were higher. For men the increase has been slightly lower. There are a number of reasons. For example, people are living longer and healthier lives, the labour force is getting older, and seniors are choosing to remain in the labour force longer.