shocking

But isn’t the age of consent 18 in the US? How does that work?

In the UK you used to be able to get married at 16, but the age of consent is 16, so it kind of made sense.

Someone else has broken down a lot of examples, but in the broader sense, around half of states, a little more IIRC, have an age of consent of 16. The reason 18 is so well known is that’s the age of consent where so much of our media is made, California.