title: Aging in America in the twenty-first century: demographic forecasts from the MacArthur Foundation Research Network on an Aging Society.
abstract: BACKGROUND
  The aging of the baby boom generation, the extension of life, and progressive increases in disability-free life expectancy have generated a dramatic demographic transition in the United States. Official government forecasts may, however, have inadvertently underestimated life expectancy, which would have major policy implications, since small differences in forecasts of life expectancy produce very large differences in the number of people surviving to an older age. This article presents a new set of population and life expectancy forecasts for the United States, focusing on transitions that will take place by midcentury.
  
  
  METHODS
  Forecasts were made with a cohort-components methodology, based on the premise that the risk of death will be influenced in the coming decades by accelerated advances in biomedical technology that either delay the onset and age progression of major fatal diseases or that slow the aging process itself.
  
  
  RESULTS
  Results indicate that the current forecasts of the U.S. Social Security Administration and U.S. Census Bureau may underestimate the rise in life expectancy at birth for men and women combined, by 2050, from 3.1 to 7.9 years.
  
  
  CONCLUSIONS
  The cumulative outlays for Medicare and Social Security could be higher by $3.2 to $8.3 trillion relative to current government forecasts. This article discusses the implications of these results regarding the benefits and costs of an aging society and the prospect that health disparities could attenuate some of these changes.
authors.affiliation: University of Illinois at Chicago, USA. sjayo@uic.edu
authors.forename: S Jay
authors.initials: SJ
authors.lastname: Olshansky
authors.forename: Dana P
authors.initials: DP
authors.lastname: Goldman
authors.forename: Yuhui
authors.initials: Y
authors.lastname: Zheng
authors.forename: John W
authors.initials: JW
authors.lastname: Rowe
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004641:Emigration and Immigration / Q000639:trends*; D005260:Female; D005298:Fertility; D006302:Health Services Research / Q000458:organization & administration*; D006801:Humans; D008017:Life Expectancy / Q000639:trends*; D008297:Male; D008875:Middle Aged; D009026:Mortality / Q000639:trends*; D011157:Population Dynamics; D014481:United States; D019131:United States Social Security Administration