This is my experience (as a man), in my 50's.
At 20, the girls are mostly interested in excitement and looks. They will drop boys for extremely superficial reasons.
At 25, the young women have matured. But they, are craving passion and excitement, and think that that is what Love is. They want it all. Passion career, looks, family. They will date with long checklists, and drop people based on that (Allergic to Cats -- no way)
At 30, the woman has figured out who she is, and her value is not defined by the man...but, she also hears the tic kicking of the biologic clock. She is more accepting of little things, and the big things are different. For example, a calm person who treats people with respect is more valuable than the edginess of an ....She knows who she is and what she wants.
FWIW, I married a woman in her early 30's when I was in my mid 30's.
At 15-22, I was too nerdy to attract anyone. I was funny and smart. At 22-28, I was in grad school, and too poor to date. I was passionate about my field, funny, smart, and could talk about a lot of things. Oh, and I lost on Jeopardy. In my 30's, I was a professional, making decent (not great) money, still had my health and hair, a good sense of humor, and could talk about many things.
Today, at 51, I am witty, earn good money (by anywhere but DCUM standards), am a good father, faithful (sorry), can talk about anything, still have my hair in 95% original color, though a salt and pepper beard....tragically, my health did not make 50, as I have had two types of cancer and cardiac issues. And Mr Happy still works, but not has well as 20 years ago.
What I was on the outside at 25 changed. On the inside, it has not -- funny witty, and smart.