gerontology /ˌʤerənˈtɑːləʤi/ noun Learner's definition of GERONTOLOGY
[noncount] technical
: the scientific study of old age and of the process of becoming old老年学
— gerontological
/ʤəˌrɑːntəˈlɑːʤɪkəl/ adjective — gerontologist
/ˌʤerənˈtɑːləʤɪst/ noun, plural gerontologists [count]