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We discuss how information processing may change over a person’s lifespan and how changes in information processing may influence a person’s experience of time. Two assumptions are considered: (a) Subjective time is related to the overall information-processing rate, and (b) the experience of duration is related to the total amount of information processed (cumulative reduction of uncertainty). Taken together, these assumptions suggest that age-related changes in human information-processing rate may be at least partly responsible for the “quick passage of time” that is associated with aging. In addition, a person’s experience of the duration of his or her life (and longevity) may be related to the cumulative amount of information processed. To explore these issues, we review evidence on age-related changes in time estimation (duration judgment). These age-related changes may be influenced by several factors. We review age-related changes in (a) information-processing rate, as revealed by studies on reaction time; (b) body temperature; (c) divided attention; and (d) memory. Finally, we discuss an implication of these assumptions, that human experience of longevity can be increased not only by increasing chronological age but also by increasing the information-processing rate and thereby the total information processed.
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