“While humans can always learn new things at any stage of life, as the body gets older there is both a physical and cognitive decline. Several classic research studies have documented that neurotransmitter levels (e.g., dopamine and serotonin) decline about 10% after early adulthood; the physical weight of the brain declines 5% per decade after age 40 years; and neurocognitive issues (e.g., Alzheimer disease) are most prevalent in adults 65 years or older (Damoiseaux, 2017; Peters, 2006; Wyss-Coray, 2016). Luckily, one of the best ways to help counter the cognitive decline associated with aging is to stay physically fit (Macpherson et al., 2017).”
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