The oldest U.S. Postal Service worker recently retired at the impressive age of 95 [source: Gandel]. That alone should be proof that the federal government doesn't have an age bias. The truth is the government is losing a third of its workforce over the next couple of years because of retiring baby boomers, which presents excellent opportunities for experienced retirees looking for part-time positions [source: Bankrate.com].
The source for federal job openings is USAJobs.gov, which you can search by position, location, keyword and more. The National Park Service is always looking for qualified seasonal workers to fill summer positions as visitor assistants, park guides and maintenance workers [source: National Park Service]. Park workers earn around $15 an hour, but applicants with strong experience in botany, history or geology could get a little more [source: Hannon].