Abstract
A Martian attempting to understand the human condition might be rather baffled to discover that we use the same term—“memory”—to describe the processes that allow us to ride a bicycle, know that the sound “bahy-si-kuhl” refers to that contraption, recount the story of our last ride, and successfully meet our friends at the correct time and place for the next journey. Likewise, as discussed in Chapters 1–3, “aging” is a complex, multidimensional term that varies in both its theoretical scope and in how it is operationally defined across studies (e.g., healthy vs normal vs preclinical; cross-sectional vs longitudinal; chronological age as time from birth vs time to death).
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