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This cross\u2010sectional study examined cognitive performance of crystallised\/fluid intelligence, working and long\u2010term memory of adults with intellectual disability of etiologies other than Down syndrome (IQ 50\u201368) and adults with typical development (IQ 85\u2013114) in four age cohorts (30\u201339; 40\u201349; 50\u201359; 60\u201369).<\/jats:p><\/jats:sec><jats:sec><jats:title>Method<\/jats:title><jats:p>The WAIS III<jats:sup>HEB<\/jats:sup> and the Rey\u2010AVLT were administered to both groups.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Four patterns of cognitive performance were found: (a) Vocabulary (crystallised intelligence), Spatial Span Forward and Retention yielded similar scores across all four age cohorts in participants with typical development and with intellectual disability. (b) Similarities, Raven and Digit Span Backward exhibit lower scores only in 50\u201359 or 60\u201369 compared to the 30\u201339 age cohort in both groups, (c) Digit Span Forward, Spatial Span Backward and Total Leaning (LTM) yielded lower scores in the 50\u201359 or 60\u201369 age cohorts in the typical group, but similar scores in participants with intellectual disability along the age cohorts, (d) Block Design (fluid intelligence) yielded a lower score in the 50\u201359 cohort versus lower scores only at ages 60\u201369 in participants with typical development.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Our findings suggest a possible parallel trajectory in age\u2010related cognitive performance for individuals with and without intellectual disability in six measures, and a possible more preserved trajectory in fluid intelligence and some memory measures in adults with intellectual disability compared to their peers. Caution should be exercised regarding Digit and Spatial Span Backwards, which yielded a floor effect in participants with intellectual disability. 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