Determine if the sentence is true based on the text below:
John Boy quit darts for good when he was 35 years old.

John Michael Walton (born 10 November 1961 in Bradford, Yorkshire) is a former World No. 1 English darts player who played for the British Darts Organisation and Professional Darts Corporation. He is best known for winning the 2001 BDO World Darts Championship. He has adopted the nickname John Boy and uses the song "Cotton Eye Joe" by Rednex as his walk-on theme.
It's impossible to say