"That's certainly, I think, number one, but it's so hard to ... I mean, if you look at the actors who portrayed Bond, it's very hard to pin down any common characteristic," he added.
Sean Connery first played the fictional spy created by author Ian Fleming. He was followed by George Lazenby, Roger Moore, Timothy Dalton, Pierce Brosnan and, finally, Craig.
Broccoli said choosing the right actor was paramount to the franchise's success.
"Thank goodness they cast Sean Connery originally because I think if it had not been him, who knows whether we'd still be here 60 years afterwards. And each one of the actors has transformed the series in a new direction, kept them fresh and relevant for the time."
