Authorities expanded their search Saturday for a 79-year-old hiker with dementia missing in San Mateo County since Thursday.
Margaret “Elaine” McKinley of Redwood City became separated from her family around noon Thursday while hiking at the Windy Hill Open Space Preserve in Portola Valley, according to the San Mateo County Sheriff’s Office.
McKinley is 5 feet 2 inches tall, weighs 130 pounds, and has gray hair and brown eyes. She was wearing a red jacket, black pants and tan boots and carrying a dark backpack while walking along the Lost Trail…