I'm still playing around with demographic data, and one thing I've done is trace out a timeline of how we ended up having the population aging problem in the first place. I even prepared an animated gif file: a WCI first.
We start when the data do - in 1921:
This is the last census year in which the age profile is monotonically decreasing in age.
The arrival of the Great Depression also depressed the number of births. This is more visible in 1941:
The 1961 cohort of births - of which I'm a member - is the largest in Canadian history:
In 1981, those massive cohorts born in the late 1950s and early 1960s were entering the labour force, so the 1982 recession was particularly ill-timed:
In 1991, you can see what David Foot calls the baby boom 'echo': the small increase in births as the baby boomers reached the age in which they would become parents:
That slight uptick didn't last long, though:
Which brings us to where we are today:
And just for fun, here are all of these graphs put together as an animated gif: