Nonagenarian is a noun for a person who is between ninety and ninety-nine years old. It is a formal, precise term often used in medical, journalistic, or scholarly contexts to describe age without ambiguity.
Nonagon
How to Pronounce Nonagon
Nonce
How to Pronounce Nonce
Nonchalant
How to Pronounce Nonchalant
Nonchalantly
How to Pronounce Nonchalantly
Nonconformists
How to Pronounce Nonconformists