These pages contain the trends of millennia and centuries. The individual century pages contain lists of decades and years.
See also History for different organizations of historical events.
... 29.5% under the age of 18, 6.7% from 18 to 24, 33.6% from 25 to 44, 20.6% from 45 to 64, and 9.6% who are 65 years of age or older. The median age is 35 years. For every ...