Wow, the "The 2015 Ageing Report", published by the EU, all 436 pages of it, is one hell of a lot of data about all the factors of ageing throughout Europe.
We are talking data forecasts (I think the word used are extrapolation).
So for instance, by 2060 Europe's largest country (GDP) will be the UK. Germany, falls to third.
Now all of this is based on simplistic extrapolation from today's data and much of relies on the growth / decline of the population.
If you are a numbers person and want an alternative data source than the UN then you must download this report. Dick Stroud