Cognition certainly declines with age at the population level. See e.g. https://pmc.ncbi.nlm.nih.gov/articles/PMC4906299/.
yes but he's 30 not 90, and knowledge and experience continues to accumulate through life, which can certainly compensate
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yes but he's 30 not 90, and knowledge and experience continues to accumulate through life, which can certainly compensate