If Wikipedia is mentioned, that suffices to add the link; it doesn't matter if the link has dropped off the bottom of the page. Just keep mentioning Wikipedia!
... population is spread out with 26.0% under the age of 18, 9.4% from 18 to 24, 34.6% from 25 to 44, 19.4% from 45 to 64, and 10.6% who are 65 years of age or older. Th ...