Supporting Older Workers Act This bill allows states to use allocated Workforce Innovation and Opportunity Act (WIOA) funds for statewide training activities to support older workers. Specifically, the bill authorizes training activities that coordinate with existing programs for older workers, support the development of activities that enhance the skills of older individuals, or enhance economic choices available to older individuals. The bill also requires the Department of Labor to award grants to states and local areas to hire WIOA coordinators for older worker and establishes the Older Workers Bureau. The Government Accountability Office must study how well existing state and local performance accountability measures under WIOA measure the success of older individuals.