Evidence is reviewed that for older adults the period from 10 to 30 years of age produces recall of the most autobiographical memories, the most vivid memories, and the most important memories. It is the period from which peoples' favorite films, music, and books come and the period from which they judge the most important world events to have originated. Factual, semantic, general-knowledge, multiple-choice questions about the Academy Awards, the World Series, and current events from this period were answered more accurately by two different groups of 30 older adults tested 10 years apart. A cognitive theory based on the importance of transitions and several noncognitive theories are considered as explanations of this pervasive phenomenon.Adolescence and early adulthood are special times for memory encoding. There is solid evidence that people recall a disproportionate number of autobiographical memories from that period when they are asked to recall important events, or recall vivid memories, or recall the first event that comes to mind when they are cued by a word. There is also some evidence, which we will add to here, that people answer general-knowledge, semantic-memory questions more accurately if the questions are about information that they have learned during those years. Adolescence and early adulthood are special in other ways. In our culture, it is when people come ofage, when their place in society is formed. It is a time ofidentityformation (Erikson, 1950). It is the time oftheir generation (Schuman & Scott, 1989), their era (Sehulster, 1996). Things were better then, or at least more vivid and exciting. It is the time for which we have the most nostalgia (Holbrook, 1993
3In this paper, we will first review the autobiographicalmemory and preference literature in order to document that events or activities that occur between the ages of 10 and 30 are recalled more often and judged to be more important or better than events or activities from other age periods. This increase in performance with respect to, or preference for, the time between the ages of 10 and 30 constitutes what may be called a bump, and we will also describe the range ofphenomena for which this bump exists. Next, we will describe a study in which we used objective five-choice questions about three domains of public information in order to extend this finding to the recall ofsemantic, general-knowledge factual information. We will suggest four accounts, based on different approaches in psychology, of why this bump in memory and preference might occur. Thus, we will first document and extend the existence of the phenomenon and only then try to understand it (Rubin, 1989;Rubin & Wenzel, 1996). We have chosen to do this in part because although theories have been put forth to explain the bump in autobiographical memory and other domains, the bump occurs in a range of situations, and it seems parsimonious to consider theories that could account for all the data. For instance, showing that the bump occurs for factual, semantic memory c...