Follow-up studies on the Lothian Birth Cohort 1921 suggested that intelligence fluctuates over time, as shown by the lack of significant correlations between the scores at the Moray House Test obtained throughout the lifespan.

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The Lothian Birth Cohort studies, including the 1921 cohort, generally found that intelligence is remarkably stable over time. The studies showed significant correlations between intelligence scores obtained in childhood and those obtained in later life, indicating that while there may be some fluctuations, intelligence levels are relatively stable across the lifespan.

Follow-Up Studies on the Lothian Birth Cohort 1921 Suggested That