Penna becomes 3rd US state to ban child marriage! Woohoo!

Mrrzy, I am confused. I had assumed that Penna was an abbreviation of Pennsylvania but, according to Wikipedia: "Since 2018, three states, Pennsylvania, Delaware and New Jersey have banned underage marriages without exception."

It would appear that whichever state you are referring to is, at least, the 4th.

If one of the participants is underage, how can the marriage be legal?
If it is not legal, why is specific legislation required to ban it?
In the case of child marriages, up to what age are people still considered to be a child?

DC