b'AGING IN THE 21ST CENTURYCONTENTS 1 2WORKING LONGER THE AGING BRAIN6FOREWORD 20TRENDS IN WORKING LIVES36ASSESSING DEMENTIA IN THE INTRODUCTIONWho is Working Longer?POPULATIONPaths to Retirement Challenges10WHAT DOES HRS MEASURE? 24ARE WE HEALTHY ENOUGH Proxy InformantsIncome and WealthTO WORK?Informant ReportsHealth and Use of Health ServicesUnused Capacity 39THE FIRST NATIONAL DATA EmploymentChronic Disease and DisabilityFamily ConnectionsImpact of Health and Economic41RISK FACTORS FOR DEMENTIA Creating a Biosocial Survey Resources on Retirement Genetic and Demographic RiskPsychosocial and Lifestyle Factors EducationSupplemental Off-year Studies 30PROGRAM EFFECTS ON WORK Medical RisksAdministrative Linkages Changes to Social Security Behavioral FactorsLongitudinal Cohort Design Shift from Defined Benefit to Defined Contribution Pensions 44COMORBID CONDITIONS14GOING GLOBAL The Role of Health Insurance 45MEDICAL, SOCIAL, AND15EXPANDING ACCESS AND USE32CONSEQUENCES OFECONOMIC IMPACTOF THE DATA RETIREMENT Medical ConsequencesLifestyle Changes in Retirement Caregiver Burden15IMPACT Retirement and Health: Economic Costs16A SCIENTIFIC FOUNDATION Use It or Lose It? 47POSITIVE TRENDSFOR POLICY Retirement SatisfactionIs Cognitive Reserve the Key? Social Security and MedicareThe Role of Families17THE FUTURENew LinkagesObtaining Whole BloodFrontiers in Genetic DiscoveryTackling Alzheimers2'