Ardmore Police have issued a Silver Alert for Yvonne Irvine, 79, of Lone Grove. According to reports, Irvine was last seen near her residence in the 300 block of Enterprise Road in Lone Grove. Irvine is described as a white female wearing a white shirt, jeans, black shoes and read glasses. Reports indicate that Irvine has dementia and recently talked about wanting to return to the Blanchard area.