FrontMatter -- Reviewers -- Preface -- Contents -- Summary -- 1 Introduction -- 2 Characterizing and Assessing Cognitive Aging -- 3 Population-Based Information About Cognitive Aging -- 4A Risk and Protective Factors and Interventions: Lifestyle and Physical Environment -- 4B Risk and Protective Factors and Interventions: Health and Medical Factors -- 4C Risk and Protective Factors and Interventions: General Cognitive Aging Interventions and Next Steps -- 5 Health Care Response to Cognitive Aging -- 6 Community Action: Health, Financial Management, Driving, Technology, and Consumer Decisions -- 7 Public Education and Key Messages -- 8 Opportunities for Action -- Appendix A: Meeting Agendas -- Appendix B: U.S. Surveys and Studies That Include One or More Items to Measure Cognition -- Appendix C: Committee Biographies.