Things have been made much easier for the 35+ woman since the advent of swipe apps and social media platforms.
I've been skeptical of The Wall many times in comments on this board, including some in this thread.
For the 35+ woman now, so long as she doesn't have children (a lot of 35-40 year old Millennials don't), she'll still draw a lot of attention on a swipe app or social media. Even single moms get fawned over on swipe apps and social media platforms.
@Mike32ct gave the example of the early 50s overweight woman who gets many penis pics on swipe apps/social media, and chooses to have sex with the biggest penises.
In the pre-internet era, you could have made a case that there was a Wall for women around 30-35, but even then, it was a flimsy case. A 35 year old even then could find a man. She'd have to work a lot harder at it, including a lot of time at in-person events, but it could be done.
When you hear these 35-50 year old women complaining "Where Have All the Good Men Gone?", this is mostly a function of them having delusional standards. Most 35-50 year old women now have abundance and plenty of male options. Even the ones not on swipe apps. The ones who aren't on swipe apps are usually active on at least one social media platform and have DMs to choose from. If for some reason you can find a woman who is not active on either swipe apps or social media, she'll still have enough options.
It's more difficult if you're overweight or a single mom between 35-54, but even those women can find men, as evidenced by the example cited by
@Mike32ct that I mention earlier in this thread.
The typical 35-40 year old woman still has more abundance that the typical 35-40 year old man.