He told The Mirror: 'Since the Parkinson's I'm still the same in many ways, but I don't think as sharply as I need to to be a stand-up, I've done 50 years and that's plenty.
Quitting is the right thing to do. 'Billy went on to explain that he has 'no regrets' or complaints about his impressive career, saying that he has been 'damn lucky' in everything that he has achieved.
He continued: 'I achieved everything I wanted, played everywhere I wanted to… I did it all. 'Looking back on his career, he admitted he 'won't miss the panic' he got before heading on stage for a live performance, comparing it to walking the plank'.
Billy, who is known for not writing his shows but instead relying on his off-the-cuff comedic flare, said his nerves became.
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