I am glad you directed your article to young women in their late teens and early 20's. It's good advice for women of that age group.
A female at 16 has no business dating a guy even a few years older.
But as women age, age differncees in relationships become less a factor.
By the time she is 45, there is nothing wrong with dating a guy 60. Depends upon their compatibility, shared interests, and matching activity levels.
When she is 55 or older, age shouldn't even matter anymore. She is free to be with someone younger or older. Or to be with no one and remain single.