I can not/do not speak for others but I find even the suggestion highly repulsive and seriously abnormal for participants on either side.

I consider it a form of pedophilia for a woman of that senior an age to exploit the curiosity or fantasies of someone young enough to be their son or even grandson.

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My second wife was old enough to be my daughter. It was not repulsive, it was not purely sex driven in fact it was a much more mature relationship than my previous marriage to a woman who was my age.
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It is not and equal relationship and is a risky one for both partners. Someone so hyper sexualized that they have to pray on someone so junior would most likely be a serious health risk and the younger person is risking any number of STD's and or allegations of rape, assault, or criminal mischief. I would consider having sex with someone that junior as a form of mental illness from body dysmorphic disorder to dementia.
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What is so bad about it? Some young men, rightly prefer maturer women. That is not a guarantee of getting VD or Aids. Sex, btw is not just a matter of age and fresh beauty. Older women can and often are extremely attractive. Also you can have a decent conversation with them before or afterwards.
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I consider any person that junior seeking a and older woman to have as a partner; especially a sexual partner, as more likely than not a previous victim and also hyper sexualized needing serious treatment for deviant behavior. Either they have seen too much porn, been so deprived, have such a disconnected self image , or so lacking social skills that they should not be having sex with anyone. They are vunerable to abuse but also incapable of knowing what they are doing is abuse.