From The Boston Globe:
Three economists − David Neumark and Ian Burn of the University of California, Irvine and Patrick Button of Tulane University − designed a field experiment to try to document how widespread discrimination is, particularly among workers nearing retirement age.

For the full story, please visit http://www.bloomberg.com/news/articles/2015-10-26/here-s-proof-that-age-discrimination-is-widespread-in-the-job-market.