nonagenarian
🇺🇸
/ˌnəʊnədʒəˈneriən/
🇬🇧
/ˌnɒnədʒəˈneəriən/
A person who is in their 90s.
Our neighbor is a spry nonagenarian who still enjoys gardening.
Referring to the age range of 90 to 99 years old.
The nonagenarian section of the population is growing.