middle age passions

Did you ever witness the gradual and horrifying developments of the middle age passions?
Those mature love-affairs where one partner goes onblowing hot
When the other has already started blowing cold,
Where age forces the amorous pair to indulge in Grandmotherly caresses and
in Grandfatherly embraces whose tenderness is not only restful but also gives rise, so to speak,
to interesting feelings of remorse about a vague sort of incest...