The SLS showed that people least likely to retain their intellectual abilities in later adulthood were low on the personality factor of:

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The SLS (Seattle Longitudinal Study) found that individuals who had lower levels of life complexity, which includes engaging in stimulating and challenging activities, were more likely to experience a decline in their intellectual abilities as they aged. Life complexity is associated with the richness of a person's mental and social environment, and higher levels of it are believed to contribute to cognitive reserve, helping to maintain intellectual abilities in later life.

The SLS Showed That People Least Likely to Retain Their