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Age-related differences in cognition are typically assessed by comparing groups of older to younger participants, but little is known about the continuous trajectory of cognitive changes across age, or when a shift to older adulthood occurs. We examined the pattern of mean age differences and variability on episodic memory and executive function measures over the adult lifespan, in a more fine-grained way than past group or lifespan comparisons. We used a sample of over 40,000 people aged 18-90 who completed psychometrically validated o