Here are the possible solutions for describing a nonagenarian clue
Answer
Clue
Relevancy
fab
Clue
Word before Four, when describing the Beatles, or Five, when describing Van Halen, or Fifteen, when describing a band I just made up with 15 awesome harpists
Definition
excellent
aged
Clue
Describing a nonagenarian.
Definition
being of a certain age; old
saloon
Clue
Describing a bar — describing a car
age
Clue
Go from octogenarian to nonagenarian
Definition
to grow old
berlin
Clue
Famed nonagenarian of songdom
Definition
(German) an old four-wheeled carriage, also BERLINE