(4th millennium BC - 3rd millennium BC - 2nd millennium BC - other millennia)
Significant persons:
Inventions, Discoveries, Introductions
Centuries
... the age of 18, 8.1% from 18 to 24, 29.9% from 25 to 44, 23.8% from 45 to 64, and 7.9% who are 65 years of age or older. The median age is 35 years. For every 100 ...