The article states 60/30% of young people, so the correct interpretation is that older men are "taking" a large share of the young, single women / young women prefer dating older men.
To use an analogy, hiring managers are allowed to offer you a job even if you already have a job. They're not obligated to wait until you're unemployed.
https://en.wikipedia.org/wiki/There%27s_a_sucker_born_every_...