nonagenarian (n.)
- boxcar
- boxcars
- centenarian
- dotard
- dozen
- eighty
- elder
- eleven
- fifteen
- fifty
- fortnight
- forty
- fourscore
- fourteen
- gaffer
- geezer
- gramps
- grandfather
- graybeard
- ninety
- octogenarian
- old-timer
- older
- oldster
- pantaloon
- patriarch
- presbyter
- score
- septuagenarian
- seventy
- sexagenarian
- sixteen
- sixty
- teens
- thirteen
- threescore
- twelve
- twenty
- twenty-five
- twenty-four
- veteran
nonagenarian (adj.)
- centenarian
- dozen
- eighty
- elder
- eleven
- fifteen
- fifty
- forty
- fourscore
- fourteen
- ninety
- octogenarian
- older
- score
- seventy
- sexagenarian
- sixteen
- sixty
- sixty-four
- thirteen
- thirty-two
- threescore
- twelve
- twenty
- twenty-five
- twenty-four
- twoscore
- veteran
