Casting director Debbie McWilliams detailed how the James Bond role needs an older actor who has the "mental capacity" to take on 007.
James Bond Casting Director: Younger Actors Have Lacked the 'Gravitas' and 'Mental Capacity' to Play 007 : r/JamesBond
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I just don't think they had the gravitas: James Bond Casting Director's Justification For Rejecting
James Bond' casting director explains reason of not taking young actors for 007
James Bond Casting Director: Younger Actors Have Lacked the 'Gravitas' and 'Mental Capacity' to Play 007 : r/JamesBond
James Bond casting director says young actors can't play 007
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Debbie McWilliams - News - IMDb