Research is the labor of finding knowledge (and information), either where it was hidden, hard to reach, or unknown. Research usually means empirical research.
... 5.0% from 18 to 24, 26.8% from 25 to 44, 27.7% from 45 to 64, and 19.9% who are 65 years of age or older. The median age is 43 years. For every 100 females there are ...