aw Kate that's shit.
I dispute the idea that attractiveness fades, but beauty lasts, firstly because it is so bound up in socio-economics as you yourself acknowledge honeybadger. No matter how beautiful you are, if you bloat out because you are taking steroids for cancer, or if you smoke like a chimney and drink every night for years, or if you have a permanent frown and hardened bitter expression from a life-time of shit, you are not going to look so beautiful. Whereas if you have a diet like Gwyneth Paltrow, no fear or stress about covering the basics in life your beauty will stand the test of time. Also, in my opinion, attractiveness is the whole caboodle - beauty, charisma, warmth, wit, charm, grace, talent, intelligence, health, style, etc - most of which can actually increase with age.
But I feel really uncomfortable trying define what is objectively beautiful or attractive or the reverse anyway because it is a slippery slope to the fascist ideology of eugenics imo.
(Responding to some discussion upthread about objective beauty and ugliness based on on natural selection) I get that 'health' is a very sensible thing to prize in a mate, but there is a lot of cultural conditioning involved in what is defined at 'beautiful' and 'ugly' isn't there? It is too important to overlook how the notion of objective beauty standards based on evolutionary psychology works to preserve the status quo.
It is easier to 'other' another group if you tell your 'own' that the 'others' are ugly. For example beauty standards are extremely racist. In the uk not so long ago the facial features common to being Black or Jewish were seen as ugly. 'The Scandinavian blonde' is upheld to be the ideal (particularly for women) even today - and I think it is no coincidence that people still openly say that 'gingers' are ugly when historically the Celts have been more resistant to suppression than any other Caucasian tribe.
Cultural conditioning must have a big impact upon what we perceive as beautiful or ugly because these perceptions evidently differ according to culture, to the point I think we are all so culturally biased, it is possible to have any meaningful 'science' in this area. I'm really convinced of this because of my own kids. With DC1 I have been really careful to challenge stereotypes, discourage making value judgements based on looks and heavily censor the exposure to the media. This has worked so well DC1 astonishes me by seeming oblivious to some things eg- someone having an amputated limb. And since it worked so well with DC1, I took it for granted and didn't bother being so fastidious with DC2 and the difference shows. DC2 stares and makes comments about people who look different and really latches onto girls with long blonde hair, as thought they are some special celebrity, etc. (Hey ho - I have a lot of media damage limitation there)
Also - in the past I have sometimes felt embarrassed for fancying a particular person - particularly when I was young. Clearly there are plenty of disputes to be had about what constitutes gorgeous/beautiful and plenty of shaming of people who like something a bit different. I remember as a kid thinking Sharon from Eastenders was the archetypal gorgeous woman, and Daley Thompson was the gorgeous man (clearly being 'on the telly' and presented with a certain amount of ceremony and razzmatazz very much influenced these perceptions) - and since my own sense of aesthetics have been subjected to further cultural conditioning in the intervening years - I now now that what is understood to be gorgeous is in fact Audrey Hepburn and Brad Pitt. That understanding was definitely not innate with me.