Usually you talk about directors in terms of the way they choose camera lenses or a kind of light to create a certain effect. But to me the most valuable commodity for a movie to create is a feeling of life, and that's what A Hard Day's Night has in spades.
Music is art, art is life, and we are who we are, and all of these aforementioned women, unless they should choose not to, will be performing well into the next many decades because they are great artists.
I'm lucky the arthritis happened at the time that it did because of the record.