Interesting.
Also, FWIW, parent said "friend/dating" range. Which potentially means 20-35 may not fully apply to both categories.
I'm happy to share more insight as a man dating at 30 if you want, but just ask.
People in their early 20's are generally students, they have different priorities, lower incomes, different cultural differences etc... It seems easier to find 40yo who share my interests and my lifestyle in my experience.
They need someone ready to make a lifetime commitment - and as it's rare to marry without dating for at least a year or so, they've only got a few rolls of the dice left.
If that's not where hombre_fatal is in his life, such women won't see a future with him.
Yes, biologically speaking, having kids later in life is more doable for men than women. But you don't really want to put it off much. Kids require a lot of energy, and you want to be around for them growing up and moving out. And hopefully having their own children.
Don't be thinking you have all the time in the world!