You can look at anyone you like funny, and you can choose to not hire that person as a coach or allow/fund a partnership with that person for your minor, unemancipated child, but that's neither a legal nor an administrative standard.
This is why whether Coughlin dated minors isn't specifically a legal standard unless the state where they live has a law against the student-teacher/coach relationship within a specific age range: the age of consent in almost all, if not all, states is lower than the age of majority. In Colorado, where he lived and coached, a 17-year-old can have sex with someone who is within 10 years of their age. So from that standpoint, it would depend on the age of the woman and how old he was at the time of the relationship, not just whether or not she was a minor.
Separately, there may be administrative/professional standards set by PSA that may or may not have anything to do with age.
Speaking of "minors," unless the state age of consent is 18 in all cases, is, at best, shorthand, and at worst, inflammatory, IMO. There are a lot of different inputs to the age calculation, if age is relevant.
I wasn’t referencing John when I made that statement. It was a generalization. Me looking at the difference in maturity between the ages. Nothing more. A poster brought up a point (generalizing) a scenario if that was legal. Those are my feelings on that.