An older man and a younger woman...this is the age of Viagra so it could work. wink wink. Assuming that the "younger woman" is over the legal age of the state, a dating relationship between the two could happen between 2 mutually attracted people.
Success in an actual committed relationship is another matter although it could work providing that both man and woman meet the expectations of the other. What those expectations are depend on the man and woman. What do they desire in a spouse? Could they meet emotional, intellectual needs as well as physical needs of the other? The success in any relationship does not rest solely on age factor. there are many expectations that arise other than the obvious.