No, there isn't. Yes, there are differing views between generations and a more permissive attitude towards naked arses in 15-30s overall , but there are many young women who do not agree with public skin exposure and a lot of teenage girls who are doubling down on "modesty".
Views change all the time, we are sliding back towards "modesty" being pushed (a word I generally despise because it is often weaponised against women).
I wonder how you think views and societal expectations change, as they very much do, swinging backwards and forwards over time very pointedly. History repeats itself and is doing so now.
The fact that Ops daughter is baring her arse in public means many will judge her and it won't be all older women.
Many women from older generations are desperate to be seen as inclusive and gain some power from latching on to youthful movements so they will support public nudity regardless. Many won't care, like me. If you go into even older generations, those who lived in the 60s think wandering around nearly naked is very cool and flower power boho. Some will be more conservative in their views.
It is of course very silly to imagine young women are a hive mind of permissive beliefs. There are, as I said, many young women online now hammering "modesty" and opposed to nudity and bare skin. This concerns me, to be honest, the corrective swing in societal expectations and behaviours is rarely without cost.
So yes, overall, young people will be less likely to openly judge her. That does not mean they are not judging her. And older people would be more likely to openly judge her negatively, while many will view a woman baring her arse as acceptable, good or neutral.
Age groups are never an amorphous blob of agreement. And all have blurred outlines.
It is simply untrue to claim that no young people are judging her daughter for baring her arse in public. Of course they are. People of any generation are not, ever, a hive mind. That some might keep quiet about it does not mean the young woman is safe from negative judgement and possible consequences - even if it's down to jealousy. Some women will loathe her for signalling what looks like sexual availability. There are all sorts of factors in play.
Age is a variable and not a constant in this. There is no agreement about societal expectations of any kind across all age groups and these notions are fluid and change over time.
And, again, out in the world she has to accept that judgement comes from all sorts of places and groups. She cannot live in a bubble. So it's a good thing she has been alerted to the reality that public nudity can have consequences, and there is no way at all of telling who will be thinking what, avoiding her, gossiping about her, assuming she is easy pickings - or thinking woo hoo how empowering.
She has a right to publicly bare her arse. It's good she now knows that many people, of all ages, will not be happy about it. Hopefully she processes that reality for her own sake.