Phoenix, Arizona is one of the most popular retirement destinations in the country. In fact, Phoenix is home to the country s first 55+ active adult community. Sun City northwest of Phoenix opened its doors for sales on January 1, and experienced outstanding success. Since then, active retirement communities in Phoenix have come a long way. Retirement Community and Facility Types Active Adult Communities include single-family homes, town homes, cluster homes, manufactured housing and multifamily housing. There are two types: age-restricted and age-targeted. Age-Restricted Communities .