Engagement law? Please help

My boyfriend is 17 and he will be proposing to me a couple month before he turns 18. We are getting married 5 days after he is 18 and I'll be 19. It's not illegal to get engaged without your parents consent, right? Married, yes, but engaged? There's no such thing. I don't care what you have to say about our ages, I'm not asking for your opinions. Just if there is a law about underaged engagement. (We've been dating for about a year and a half and he's moving in with me on the day of our wedding. We are just doing it legally first and then in 2020 having an actual ceremony)

Thanks guys, I just made this for my boyfriend cuz he has strict parents and wanted to make sure.