And regarding the evidence that there is a potential biological basis, Google has thrown up some results that appear relevant.
None of which you have linked to. A link to a book doesn't count as I can't read it.
From a brief perusal of the search terms most of the studies are throwing up similar things, ie that the theory is that by simply still being around (and in decent nick, presumably), older men are signalling an advantageous degree of DNA fitness.
That's not evidence at all. That's a theory. And a pretty odd one given the proven evidence (that you have ignored) showing that older men are less likely to produce healthy offspring than younger men. Also, wouldn't the same "advantageous degree of DNA fitness" be present in older women too?
Logically, there's also the fact that there are certain traits in men generally deemed sexually valuable by women that are more likely to be present in older men.
Sorry, but how is that 'logical'? You again ignore the evidence that most women don't fancy much older men. They just don't. As I've said, women consistently express a preference for same age men on dating sites and most marriages have an age gap of under 5 years. If women were gagging for decades older men, then surely the internet woudln't be heaving with men in their 40s desperate to find younger women? Surely the average marriage age gap would be much higher than it is?
Hot celebrity men in their 20s tend to be more the province of teenage fans, usually by 20 something young women tend on the whole to have graduated to the Goslings and Hardys
Again, so what? There are plenty of hot actresse in their 40s too, with plenty of younger male fans. None of which changes the fact - and yes it is a fact - that most young women are not looking to date men in their 40s. They simply aren't.