Younger Man/Older Woman Teams in Film
Marlene Dietrich is playing a veteran diva so perhaps it's to be expected her lover, Richard Todd, is younger, a full eighteen years in fact. Yet what are we to make of Alstair Sim and Sybil Thorndike, with Sim also being eighteen years his wife's junior!!
I think Sim's part must have been written for a slightly older actor but he was such a good choice Hitchcock overlooked it. Or maybe this was an in-joke for him to cast the parents with an age gap that mirrored the Dietrich/Todd coupling?
In any case, all four are superb, particularly Alstair Sim who should have been Oscar nominated for Best Supporting Actor.