Sun City, Arizona (founded 1960) is one of the largest retirement communities in the nation and is world-famous for its active, resort retirement lifestyle that has set the standard for other retirement communities to follow. The town is unincorporated and depends on Maricopa County for services such as law enforcement, street repairs and zoning protection. Sun City boasts eleven golf courses (including the Hillcrest public course, the site of Senior PGA and LPGA tour events, and the Desert Trails course, designed by golf legend Billy Casper and course architect Greg Nash) and seven recreation centers provide swimming, tennis, bowling and a myriad of other activities. Sun City's cultural jewel is the 7,169-seat Sundome Center for the Performing Arts, the largest single-level theater in the U.S. featuring performances by world-class entertainers and a 95-piece symphony orchestra. Volunteerism is strong in Sun City. The Sun City Prides is a nonprofit corporation which assists Maricopa County in keeping Sun City clean. The group has more than 300 members who help maintain the beauty of the 217 miles of streets and medians in the community. Police protection is provided by the Maricopa County Sheriff's Office, augmented by members of the Sheriff's Posse of Sun City -- men and women who volunteer their services 24 hours a day. The Posse helps prevent crime through neighborhood watch programs, vacation watch, traffic control and home security programs. Sun City, Arizona is age-restricted. One member of the household must be 55 or older and no one under age 18 is permitted residence. The present population is approximately 45,000.