These data were collected to gain a better understanding of the living arrangements of persons 65 and older in the United States. The collection includes four related files. The Complete Person Extract hierarchical file (Part 1) contains data for households with one or more members aged 65 or older. These data consist of household records followed by varying numbers of person records that were extracted from CENSUS OF POPULATION AND HOUSING, 1980: [UNITED STATES]: PUBLIC USE MICRODATA SAMPLE (C SAMPLE): 1-PERCENT SAMPLE (ICPSR 8114) for all fifty states. The three rectangular files (Parts 2-4) are "complex household" subsets of the Complete Person Extract file. Complex households are households containing three or more persons and households containing two persons who are not related by marriage. There were 47,878 such households identified, containing 157,940 persons of whom 62,873 were 65 and over. The Complex Households file contains selected variables pulled from the PUMS housing records. The People and Elders in Complex Households files contain selected variables pulled from the PUMS person records, and specify kinship and other relationships for all persons and all elders 65 and older in complex households. Two additional rectangular data files (Part 6 and Part 7) containing all households and persons have been extracted from the original hierarchical file (Part 1).