On another note, a critical difference between the drinking/driving age discussion and gay marriage is that while it is an arbitrary number, everyone gets there eventually (short of some tragic accident). It's just when we, as a society, have decided it's ok to allow it to happen at that arbitrary age.
Being gay or not being gay is an attribute of a person. It is not fluid, you don't grow out of it. EVERYONE goes through 21 years where they can't drink and then they suddenly can, just because. There is nothing so arbitrary about being gay or not being gay. It's who you are on a fundamental level. There is NOTHING different about discriminating against someone who is gay and discriminating against someone who is black or who has a long nose or who has red hair or who was born in a clay hut on the wrong side of the tracks in French-Indo China to a potter and a seamstress at 9:30 AM on July 2nd. They're all fundamental parts of the person that they can't alter (though plastic surgery is awesome). It is nothing like an age limit, and making such a suggestion is plainly ridiculous.
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