This is kind of interesting too. I initially started just plotting the population with age=0, with the intent to visualize generations. The baby boom is really obvious in the purple curve. I then added samples at different ages, lagged to use a consistent time base. This thought this would give a probe of immigration, but that doesn't seem to be the case, as there aren't any major gaps in the first three samples in the 1850-1900 range. I think the sag in the age=60 is just life expectancy issues. That's also clearly apparent in the beyond 2000 area as well. The projection yielding the 2014-2060 isn't predicting that to improve too much it seems. |
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