I'm not claiming to be the authority. I'm just passing on information that is pretty well known. Females peak early and men peak late. It's not an opposing point of view to approach 10's. That's consistent with my world view.
Again, the situation described by OP isn't uncommon. This is a dime a dozen. With apps and hook up culture, it's easy for a female in her 40's to climb up the SMV ladder, at least for a night or two. But, not for an LTR. The graph explains why.
She can't find a guy, but she can find a 1,000 dicks.
The reality is that the guys of Victoria share my world view whether they know it or not. They're all in it for a quick lay and then GTFO.
So what can she do? Get used to a life of cats and a build a life around family instead. She won't be happy settling down with a guy that is truly at her level because she's already wired her brain to think she deserves the "hot guy" she could pull on Tinder. It's not likely either person in that LTR will be happy.
And to be clear, I use "she" in the most broad statistical sense possible. This may or may not be true of the person in question, but statistically it is true. Most of the time, this is what is really going on when a middle aged female says she can't find a guy.
Truth is you can't have it all. Society and media tell people that. But there is a reason that so many middle aged females are unhappy, on antidepressants and drink wine 7 days a week.