1054, the Great Schism, in which the Western (Roman Catholic) and Eastern Orthodox churches separated from each other. After a number of earlier such schisms, the breach was later repaired, but this one continues nearly 1000 years later.
... 34.0% from 18 to 24, 17.6% from 25 to 44, 20.5% from 45 to 64, and 14.1% who are 65 years of age or older. The median age is 28 years. For every 100 females there are ...