Context, I’m 30 now and i will find women my age and up attractive, but 15 years ago a 35 year old women would never have been attractive to me.
As I’ve aged younger women are less and less attractive (thankfully)
But when I’m 60 will 60 year old women be attractive to me?
They’re both consenting adults, and it’s just sex.
It’s yuck in the same way a teen might say old people (30+ yos) having sex are yuck.
But there’s nothing inherently wrong about it, your views are just judgemental. May also just be a cultural thing to be fair, or as societies attitude towards sex become more open, older views may still just be very conservative.