Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Page 23 Page 24 Page 25 Page 26 Page 27 Page 28 Page 29 Page 30 Page 31 Page 32 Page 33 Page 34 Page 35 Page 36 Page 37 Page 38 Page 39 Page 40 Page 41 Page 42 Page 43 Page 44 Page 45 Page 46 Page 47 Page 48 Page 49 Page 50 Page 51 Page 52 Page 53 Page 54 Page 55 Page 56 Page 57 Page 58 Page 59 Page 60 Page 61 Page 62 Page 63 Page 64 Page 65 Page 66 Page 67 Page 68 Page 69 Page 70 Page 71 Page 72 Page 73 Page 74 Page 75 Page 76 Page 77 Page 78 Page 79 Page 80 Page 81 Page 82 Page 83 Page 84 Page 85 Page 86 Page 87 Page 88 Page 89 Page 90 Page 91 Page 92 Page 93 Page 94 Page 95 Page 96 Page 97 Page 98 Page 99 Page 100 Page 101 Page 102 Page 103 Page 104 Page 105 Page 106 Page 107 Page 10817 FIG. A-3 The HRS Longitudinal Sample Design !(%!$#/$!(237AR"ABIES%ARLY"OOMERS-ID"OOMERS 9EAR !GE                             Oldest Old, or AHEAD, was first administered in 1993 to a nationally representative sample of Americans age 70 and older (strictly speaking, born in 1923 or earlier). Again, in the case of married couples, interviews were conducted with both spouses. About 8,000 people were interviewed as part of the 1993 AHEAD survey. These individuals were re-interviewed in 1995 and 1998, and they, too, continue to be inter- viewed on the 2-year cycle of the study. The original HRS and AHEAD surveys were integrated in 1998, and the consolidated project is now referred to as the Health and Retirement Study. Two new groups of survey participants (including spouses) were added in 1998. The first group consists of people in the age group that falls between the original HRS and AHEAD samples. Born between 1924 and 1930 and raised during the Great Depression, these participants are called the Children of the Depression Age, or CODA, cohort. The second group added in 1998 was the first “refresher cohort” brought in to replenish the sample of people in their early 50s as the original HRS cohort aged. It is known as the War Baby cohort, consisting of people born between 1942 and 1947 and their same-age or younger spouses. Figure A-3 shows the past and projected evolution of the HRS sample, including survey years for the different participant cohorts. In the future, the research team plans to supplement the sample with groups of younger people as they reach their 50s. For example, participants born between 1948 and 1953—the early years of the post- World War II baby boom—were added to the HRS sample in 2004. By continuing to “refresh” the sample, the HRS will provide a long-term source of data on the transition from middle age to the initial stages of retirement and beyond. (For a more complete overview of and background to the development of the HRS, see Juster and Suzman 1995.)