According to Schaie's research, the fact that most 60-year-olds today would score higher on an intelligence test than a group of 60-year-olds would have in 1940 is best explained by a cohort effect involving

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The cohort effect refers to the influence of shared characteristics of a group that was born and grew up in the same time period. Educational experience is one such shared characteristic that has improved over time, contributing to increased intelligence test scores among 60-year-olds today compared to 60-year-olds in 1940.

According to Schaie's Research, the Fact That Most 60-Year-Olds Today