An example of an issue people ought consider in "out of the box" ways versus usual child bearing age relationships.
Once an older wealthy woman with a youthful appearance is past child bearing age, age difference ought not much matter, especially if two people in love are not married. When the older person is rich and famous like Cher, that also affords the possibility of a much more interesting life. What both people in such a relationship need to understand and respect is that there may come a time when the older person has aged rapidly and for the sake of the younger person's life, may in fairness move on. So good for her!
What I don't feel positive about is the more common situation of old wealthy men that look old with young wives that is more about money and security and less about physically attractive love. In my own case as someone exceptionally youthful at age 74, I would not become involved with a much younger woman still of child bearing age unless she was already wealthy enough with an extended family to support any dependent children she might have were I to die.