How many letters does the top answer for “wrote ending aging” have?

The most common answer is grey (4 letters).

Crossword clue: wrote ending aging

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

grey 4 letters wd-fact-v3

horse of a light gray or whitish color

author of ending aging 50% similar → grey

wrote hollywood ending 50% similar → allen

wrote the sense of an ending 50% similar → barnes