Crowley, one of the main characters in Good Omens, is an immortal demon. His exact age isn’t explicitly stated in the book or the TV series, but we can make some educated guesses based on the context provided.
Crowley was originally an angel named Crawly who fell from Heaven along with Lucifer and other rebellious angels. This event is believed to have occurred around 6,000 years ago, which would make Crowley at least that old. Throughout the story, Crowley is shown to have been present during significant historical events, such as the Garden of Eden and the Great Flood, further supporting the idea that he is thousands of years old.
In summary, while Crowley’s exact age isn’t specified, it’s safe to say that he is at least 6,000 years old, given his involvement in events that date back to the beginning of human history.