The US varies by state.. Here's South Carolina's law. If you're 18, you can have consentual sex with a 14 year old. If you're over 18, you can have consentual sex with a 16 year old.
The drinking laws here have recently changed. I believe you can be in possession of alcohol if you are at least 18, but you can't be drunk (I may have my facts reversed, this only recently happened).
For marriage, both party's can be 16 but need written parental consent to do so.
The More You Know *