No, it is men's idea of scarcity. But it is not real. They hust have to download a sex app and be "less picky". But they don't want that. They want the younger women who look certain way and that have no/little sex experience. And they want that those women have sex only with them. They don't want woman who are experienced and have sex frequently and with multiple partners.
The moment a 20 something men goes to a "cougar" bar he would be the one aggresively pursued. But they don't do that. Because it is not about sex, it is about getting their way regardless what we want.