Nonagenarian
| Sexagenarian |
| Septuagenarian |
| Octogenarian |
| Nonagenarian |
| Centenarian |
| Supercentenarian |
A nonagenarian is a person in the age group from 90 to 99 years old. A nonagenarian of today is born between December 4, 1904 and December 4, 1914.
A few U.S. Presidents lived or are living to be nonagenarians, including John Adams, Herbert Hoover, Ronald Reagan, and Gerald Ford.