I don't frame it that way, either. I see it as a partnership. How you choose to view it can have a remarkable effect.
This reminds me of an old Michael Caine movie where someone asks him about his "superior" at work. He indignantly replies that's his manager, not his superior.
Henry Trewhitt: "You already are the oldest President in history, and some of your staff say you were tired after your most recent encounter with Mr. Mondale. I recall, yes, that President Kennedy, who had to go for days on end with very little sleep during the Cuba missile crisis. Is there any doubt in your mind that you would be able to function in such circumstances?"
Reagan replies: "Not at all, Mr. Trewhitt and I want you to know that also I will not make age an issue of this campaign. I am not going to exploit for political purposes my opponent's youth and inexperience."
One should not have to reframe why age discrimination is illegal/immoral to one’s manager.