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gerontology

noun
🔊/ˌdʒerɒnˈtɒlədʒi/
🔊/ˌdʒerənˈtɑːlədʒi/
 [uncountable]
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  1. the scientific study of old age and the process of growing old老年学Topics Life stagesc2
    Word Originearly 20th cent.: from Greek gerōn, geront- ‘old man’ + -logy.