As life expectancy grows and birth rates slump across the EU, around one third of the bloc's population could be over the age of 65 by 2050, a social shift with the potential to transform the lives of Europeans.
Only three years ago, just 16.5 percent of the inhabitants of the European Union's current 27 member states were over 65.
The proportion is expected to grow to 18 percent by 2010, 25 percent by 2030 and 30 percent by 2050, according to recent forecasts from the EU's Eurostat data agency.
The number of European residents over 65 surpassed those under 15 at the beginning of the decade.
Currently, the EU's "oldest" members are Germany and Italy, where the proportion of over 65s is 20 percent.
Worldwide, only Japan has so far been confronted with a similar demographic phenomenon: around a quarter its 127 million people are already over 65, and the proportion is set to grow.
The scale is greater in the EU, which has a far larger population -- currently 495 million -- and a vaster geographical spread.
From 1990 to 2005, the average European's life expectancy rose by around two years.
After hitting 65, an average man in the EU is likely to live another 17 years, and a woman another 20.
In parallel, birth rates have plunged.
The average EU fertility rate -- the hypothetical number of babies per woman of child-bearing age -- has fallen to 1.5 from 1.6 in 1990.