Society is full of “rules” about whom one can love. They attempt to define appropriate genders, structures, and even adult partners’ ages. All based on history, and all of which seem silly today.
People are attracted to who they are attracted to, he said tautologically. Once legally mature, chronological age really doesn’t enter into it.
The taboo on age difference between adults appears rooted in the idea that sex is for procreation, so people who are fertile should be with other people who are fertile. That doesn’t have much to do with romantic partnerships or recreational intimacy.
Young people can be attracted to older people and vice versa. As long as each side follows basic rules of respect and consent, and accept a “no“ when they hear one, there’s no problem.
Some other thoughts on the issue: https://pourvotreplaisir.net/2018/11/16/count-the-rings/