That's true: today, US law does disrespect property rights--not to mention the freedom of association. To that extent, however, it's US law that's in the wrong.
...illegal due to age discrimination.
Yup, freedom of association is much undermined. Luckily for me, soon it will be illegal for pretty girls to refuse to sleep with ugly guys. After all, if I can prove that she sleeps around pretty indiscriminately, then her refusing me can only be chalked up to bigotry against unattractive men.
I'm going to move to an uninhabited island when they make the unattractive, fat or smelly a protected class. And some would consider me to be unattractive, fat and smelly...