I appreciate this article on a subject in which there is wide interest. However, I'm not certain that
mostly the females pay close attention to their facial appearance
I think, for example when adolescents suffer from acne, both males and females are equally distressed. I know that men worry when age begins to show on their faces, because then they are less employable. I think marketing companies might add to the impression that women, more than men, are obsessed with facial beauty.
Of course, this assessment is based partly on personal experience. I have sisters and brothers, aunts and uncles. I see equal levels of vanity in both genders. That's my personal experience.
I think your points about lifestyle are very important. A little bit like Dorian Gray, we do wear our lives on our faces. Get a good night's sleep, eat well, avoid UV, and avoid stress. This is good advice I think for a healthy body, including the skin :)
Thank you for an interesting article.