senility

as in feebleness
the state or period of mental decline that typically accompanies old age with his increasing senility, Granddad is beginning to have more and more senior moments

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“Senility.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/senility. Accessed 1 Mar. 2024.

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