The 1,001-dwelling Dulles Discovery easily passed the Fairfax County Board of Supervisors this week, green-lighting the age-restricted development for construction in the western end of the county.

With the planned 55-or-older community, The Peterson Companies is tapping into Fairfax County’s growing population of aging residents, which is slated to swell dramatically in the coming years. The county predicts its population of residents aged 55 to 64 will grow from 111,670 in 2005 to 123,474 by 2010, and 138,519 by 2025.