The Retirement Net features Suisun City, CA Active Retirement There's a reason why California has become the most and award winning senior adult community. The Suisun City Senior Center is here to serve the active adult community members age 50 years and older. There are no membership fees, and you do not need to be a resident of Suisun City to enjoy the facility/5(9). Parks & Recreation» Active Adults» Adult City Departments; Community Please click here to go to the new location. Parks & Recreation. Adult Recreation.