Mental age

Definition and stakes

Portrait of G. Stanley Hall G. Stanley Hall,  Senescence, the Last Half of Life (1922)

“ Again, we have made great progress along another line, namely, in distinguishing physiological and especially psychological from chronological age, but here we have little consensus of either method or result beyond the early teens. Yet no observer of life can fail to doubt that there is the same and perhaps even, on the whole, greater average diversity among individuals in mental age as they advance along the scale of years. ”
Source: Gutenberg

Portrait of Robert Sessions Woodworth Robert Sessions Woodworth,  Psychology

“ If a child's mental age is the same as his chronological age, he is just average, neither bright nor dull. If his mental age is much above his chronological, he is bright; if much below, dull. His degree of brightness or dullness can be measured by the number of years his mental age is above or below his chronological age. ”
Source: Gutenberg

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