The Nonagenarian reference article from the English Wikipedia on 24-Apr-2004
(provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Nonagenarian

Sponsorship the way you would do it
Senior citizens:
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 April 10, 1904 and April 10, 1914.

A few U.S. Presidents lived to be nonagenarians, including John Adams, Herbert Hoover, Ronald Reagan, and Gerald Ford.