Richard Stallman resigns from the FSF

Age of Consent in the US has significant nuance. It's set at the state level and it varies in highly significant ways in every state in the union. Age of consent and statutory rape definitions have a lot of nuance, such as some states it's statutory rape for anyone under 18, unless the other partner is within 3 years of the under 18 individual. In other states this nuance doesn't exist. Some states allow marriage as young as 12 with parental consent, others it's 14 or 16 and I believe a few don't allow marriage at all below 18.

In other words, there is no hard and fast rule on age of consent in the US. It's entirely dependent on what state your are in.