Begun in 2011, the National Health and Aging Trends Study (NHATS) gathers information on a nationally representative sample of Medicare beneficiaries ages 65 and older. Annual, in-person interviews collect detailed information on the disablement process and its consequences. The sample is refreshed periodically so that researchers may study national-level disability trends as well as individual trajectories. A last month of life interview focuses on quality of end of life care. Periodically caregivers of NHATS respondents are interviewed in the supplemental National Study of Caregiving (NSOC). Linkages to Medicare records are also available.