Ireland's influx of immigrants, mostly Africans has made it the youngest country in Europe. Ireland Learns to Adapt to a Population Growth Spurt - New York Times. Findings from the April 2006 census, which are being published in a series of releases this summer, showed that in the four years since a previous survey, the Irish population swelled by 322,645, roughly split between immigrants and births. That lifted the total population to 4.2 million.
