The condition of looking or appearing younger than one's actual age, or a youthful appearance that defies aging.
From Greek 'a-' (not) and 'geras' (old age), literally meaning 'not old age.' This medical/biological term emerged in the 19th century to describe individuals who age more slowly visually than chronologically.
Some people genuinely seem to have agerasia—think of celebrities who look decades younger than their birth certificates claim. Scientists have linked this to genetics, skincare, lifestyle, and even certain genetic mutations that slow visible aging.
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