Maslow’s hierarchy implies that human growth is associated with adult maturity, a decrease in the prepotency of “lower” motives and an increase in the prepotency of “higher” motives. These hypotheses were evaluated with data from 1,712 participants who had been tested with the Reiss Profile, which is a standardized assessment of a comprehensive range of enduring (trait) strivings. The results provided some support for Maslow’s general idea of human growth: The lower motives (such as eating and exercise) were stronger for younger versus older adults, whereas the higher motives (such as honor and idealism) were stronger for older versus younger adults. The results demonstrated a new method for studying some of the issues raised by Maslow.