Economist piece that notes:
Between 2005 and 2030 the working-age population of the European Union will shrink by 20m, and the number of those over 65 will increase by 40m. Thanks to the focus on crumbling public finances, that demographic time-bomb is now a common part of European public debate. Governments in places like Britain or the Netherlands have been able to propose paying pensions at 67 or even 70, without angry protests.
Far bigger changes will inevitably ensue. Europe will invariably be forced to backfill even more than it is today, which leads many thinkers to propose the EU pre-emptively embraces the entirety of the Mediterranean in the manner of the old Roman Empire.
Can't beat 'em demographically, so might as well join them.