The singer confessed that he is pleased the novelty of being a part of the iconic group hasn't worn of and that he still finds himself amazed at what they achieved.
McCartney told the Metro: "I'm lucky that I've always retained a sense of wonder.
"I was looking at the George Harrison book accompanying Martin Scorsese's Living In The Material World recently and opened it at a picture George had taken of me and the other guys on an aeroplane.
"It took me right back. I was like, 'Was I really there, in The Beatles? Bloody hell!' It's obviously a stupid thought but I'm glad I haven't got used to it yet."
McCartney's latest album Kisses On The Bottom is released in the UK today (February 6) and in the US tomorrow (February 7).
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Watch Paul McCartney and producer Tommy LiPuma discuss new album Kisses On The Bottom below: