Fortunately most instances are in the category of a 17 year old to an 18 year old, and require parental consent and some manner of judicial approval, but the rates of “not that” are still much higher than one would want.
~300k in a 20 year window total, 74% of the older partner being 20 or younger, and 95% of the younger partner being 16 or 17, with only 14% accounting for both partners being under 18.

There’s still no reason for it in any case, and I’m glad to live in one of the states that said "nah, never needed .