Bodies of research show that women have a genuine, visceral attraction to men their own age: https://www.google.com/amp/s/www.businessinsider.com/dataclysm-shows-men-are-attracted-to-women-in-their-20s-2014-10%3famp

Indeed, women are more likely to settle for an older man on second marriages when they are older, likely due to fewer options to get their first choice, a man their own age: https://www.pewresearch.org/fact-tank/2014/12/04/tying-the-knot-again-chances-are-theres-a-bigger-age-gap-than-the-first-time-around/. The older the bride, the more likely there is to be a larger age gap with the groom.

Age-heterogeneous couples are more common in those with lower socioeconomic status: https://www.tandfonline.com/doi/abs/10.1080/01494929.2015.1060289. Women with higher RMV leverage that to get a man they're actually attracted to; a man their own age.

What becomes of the women (largely on their second or third marriages) who settle with/for an age-gap man? More often than not, it doesn't work out: https://www.google.com/amp/s/www.marketwatch.com/amp/story/the-bigger-the-age-gap-the-shorter-the-marriage-2014-11-11, https://www.google.com/amp/s/www.dailymail.co.uk/news/article-3551001/amp/Age-gap-leads-divorces-One-five-couples-end-marriage-seven-years-age-difference.html.

If a woman is with a man who is significantly older, that's not indicative of his high value, but rather, more typically it is indicative of her own self-assessment and belief that she is low value, and cannot do any better; she thinks she cannot attract or keep a man her own age.