How old do you have to be to check into a sybaris suite?

My girlfriend found this place called sybaris right by where we live (the closest one is in downers grove illinois) and its like a little honeymoon suite kind of place where couples go to get away and we are 19. we really want to go and I am trying to figure out how old you have to be to check in to this place. we have been dating for almost five years and want to do something special this summer. please help!!