Is it true that after 40, men only look at younger women?

I recently read a book about male psychology. It contained a rather provocative idea: supposedly, after 40, men only start paying attention to women much younger than themselves.

And I found myself wondering—is that true?

Is it really all about a young, toned body?

Then why do we women try so hard? Why do we take care of ourselves, watch our figures, want to be liked and feel beautiful?

With age, it's not just appearance that changes. Confidence, experience, and self-understanding develop. A woman begins to better understand her strengths, becoming a deeper and more interesting person.

And sometimes I get curious...

Do men like mature, confident women? Those who know who they are and what they want from life?

And another question that sometimes pops into my head:

Will a man like me, say, at 45?

Or do most men really start looking for someone younger—a new, beautiful woman by their side?

I'm really interested in hearing an honest opinion.
What do you think really attracts men after forty?