A woman in a stable relationship with kids that is happy with her life retain her youth energy much more compared to a woman pumped&dumped countless times that has a worm eating her from the inside.
Being constantly in the early stages of mating interactions takes its emotional toll on both women and men.
When women don't secure commitment and are regularly experiencing failed relationships of less than 2 years in length or experience casual sex/situationship failure, it takes its emotional toll, which can lead to physical consequences too. If this continues over a 10-20 year or more period, there will be impact. Right now, you are seeing Millennial women born in the 1980s turning 40 without marriage or kids. These 40 year old Millennial women that are never married and childless have spent the last ~25 years in LTRs that didn't last and they successfully used birth control to prevent babies. That's more of a White, college educated Millennial woman thing.
When a woman does have more security from a decent long term relationship, she'll experience less anxiety and less depressive feelings. She will have a healthier emotional state and that can help her look better, even without plastic surgeries. Plastic surgeries will help as
@jaymbrs is seeing. Most long term relationships do diminish in quality over time.
@jaymbrs has no idea if his male clients with wives have happy marriages or it just looks that way to the outside world. It's likely a mixture of both. Married people are often good at hiding their problems from outsiders. These 50-60 year old married people have been together 20+ years in most cases. Longevity does not equal quality.
When men have early stage relationships that don't lead to committed relationships, the impact depends on what happens in those interactions. The impact is minimal for the "Chad" and "Tyrone" type top-tier men who are getting the sex from a lot of women. For the average to below average guys having many "one date, no sex, no second date" type dates from swipe apps when the women refuse their second date offers, that's going to take an emotional toll and lead to MGTOW/incel type behaviors.