Boomerville, north of Cold Spring, will soon be home to an “Elder Garten” ­­— fun and activities for both mind and body for those at the other end of the age spectrum from kindergarten. The Elder Garten building is filled with warmly decorated rooms stocked with games, books, toys and maps. “It’s a place to come and socialize,” said creator Mike Nistler. Boomerville is also an event center, hosting weddings, reunions, birthdays, business meetings or parties in the rustic country lodge.