Eventually, Terramor in Riverside County, Calif., will have 1,443 single-family houses in 16 neighborhoods. (KB Home)

Active adult communities, typically restricted to residents ages 55 and older, are traditionally built as separate developments for retirees and pre-retirees who prefer to live with people their own age.

But a new trend appears to be underway: planned communities with both an active adult neighborhood and multigenerational neighborhoods.

In Temescal Valley, in Riverside County, Calif., Foremost Companies recently opened two all-age neighborhoods at Terramor, a planned community that is already home to two active adult neighborhoods built by Del Webb. Eventually, Terramor will have 1,443 single-family houses in 16 neighborhoods.

In the Washington, D.C., region, the Two Rivers planned community in Anne Arundel County, Md., started as an active adult community and then later added an all-ages neighborhood to the development. At the Dominion Valley development by Toll Brothers in Prince William County, Va., an active adult community is nestled within a multigenerational development.

At Terramor, KB Home recently opened six model homes within its Sorrel and Caraway neighborhoods. Priced from the low $500,000s, the 170 single-family houses range from 2,229 to 2,787 square feet with up to six bedrooms, four bathrooms and a two-car garage.

Del Webb has already sold more than 65 houses in its active adult neighborhoods at Terramor, known as Cortina and Ardena. CalAtlantic Homes anticipates opening Sterling, another active adult neighborhood, later this winter.

The Veranda, which is open to all Terramor residents, includes outdoor swimming pools, a barbecue and entertaining spaces. The Terrace Club, which will be designated for 55-and-older residents, will include a 20,000-square-foot clubhouse, indoor and outdoor pools, tennis, bocce ball and pickleball courts. All residents can use five miles of walking trails with rest areas as well as dog parks, a community garden, ballfields, tot lots and a basketball court.

For more information, visit terramor.com.

To pass on a tip or item, contact us at realestate@washpost.com and put “Town Square” in the subject line.