Women instinctively value security – a man who can provide , which translates to financial security in modern era. A man really starts earning around age 30 and it usually goes up from there.
Studies have also show that men are happier when they are older, opposed to women are generally happier in the prime of their youth.
So, there you go. A man’s market value goes up and a woman’s value goes down, as they age in mating context.
This all might sound sexist and come off as highly offensive to some in this age, but we can’t deny the nature and our instincts.