[stale2002]

Appeal to authority.

Either age discrimination is morally OK or it isn't.

I don't care whether it is legal or not. If you are engaging in this discrimination you are exactly morally the same as any other person engaging in discrimination, whether that be based on age, sex or race.

[codeonfire]

It's not a question of morality. The act doesn't cover people under 40 because there was no finding of age discrimination. Just like there is no discrimination against white people or men ;). Don't like it, run for Congress or Supreme court.

[stale2002]

Or instead of that, I could condemn people who engage in age discrimination in the same way that I would condemn racists, bigots, or sexists who engage in discrimination.

There are lots of places in the world where discrimination on race, gender, and sexual orientation is legal.

And people who engage in this kind of behavior, even when it is legal, are still horrible people, and should be treated as such, by society.

It is fully within my rights to judge horrible people, and to also treat horrible people as they deserve to be treated (ie, I will treat them poorly, as they deserve).

People are often under the mistaken impression that the only way to punish someone is through the law.

That's incorrect. There are many many perfectly legal ways to punish horrible people, and there are even methods of punishing horrible people that are illegal but you are unlikely to get caught for.