Social engagement and friendship have a positive impact on brain health and can mitigate against the decline associated with Alzheimer's disease and dementia in later life. On the other hand, social isolation is a major risk factor for poor brain health. Therefore, it is important to prioritize and cultivate friendships. Additionally, the question of why we age and why we can't live forever is being explored by scientists. While some believe in the possibility of immortality, there is little evidence to support this idea. Life span refers to the maximum number of years an individual can live.

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