I'm 21 but I guess that makes me an old fart in your eyes. I act no differently now then I did 3 years ago. My opinion that this is youth discrimination is no less valid just because I aged a few years. If you understood the history behind sidekicks you would understand why it's not youth discrimination. If anything, a character like Nightwing should completely shatter your argument. He started as a sidekick but has grown to be his own man, and for a time even donned his mentor's cowl. That's far from discriminatory if you ask me.