The former Beatles star is now 69 years old and still performing and admitted his management warned him off continuing in music almost 20 years ago.
He said to UK's MOJO magazine: 'One of my old guys who I used to have as my manager, I was knocking 50 and he said: 'I think it's time you retired.'
'I thought, I know what you mean, but I don't really feel like it, you know.
'And if I'm really enjoying this, why retire? So I decided against it, and got rid of him. I wonder what he thinks today. Perhaps that he was right, but hopefully not.'