IPA: /ˌdʒɛrənˈtɒlədʒɪst/
KK: /ˌdʒɛrənˈtɑlədʒɪst/
A doctor who focuses on the health and care of older people.
The gerontologist provided valuable advice on how to improve the quality of life for seniors.
Gerontologist → It is formed from "geron" (from Greek "gerōn", meaning old man) and "-logist" (from Greek "logia", meaning study or science). A gerontologist is someone who studies the aging process and the issues related to elderly people.
Think of 'geron' meaning 'old man' and '-logist' meaning 'one who studies' — a gerontologist is someone who studies the elderly.