How many letters does the top answer for “author of the age of reason” have?

The most common answer is paine (5 letters).

Crossword clue: author of the age of reason

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

paine 5 letters wd-fact-v3

American Revolutionary leader and pamphleteer (born in England) who supported the American colonist's fight for independ

author of axial age 50% similar → jaspers

author of ice age 50% similar → romano

wrote the age of reason 50% similar → paine