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A person who is old enough to know better but still has the energy to swear at you for no reason and probably has a bad habit of eating ice cream for dinner.
My grandpa is an octogenarian and still yells at the TV like it owes him money.
My neighbor is an octogenarian and eats ice cream for dinner like it's a religion.
My uncle is an octogenarian and cusses at me for not knowing the meaning of the word 'salsa'.