Yes, I seriously do believe that you are experiencing age discrimination, and it just is not going to stop, just like so many with that sexual discrimination. There is no brainwashing for it at all, where there is a couple of news articles from PBS Newshour, where they flat out proved how beneficial it is to have older persons working for them.
And GOD FORBID that with the human species, facts represent themselves, as the facts for employing older people really are good and not disputable, even with how one will say, "I don't want to hire another person when the old one dies". where that is flat on its face as so many are living to 80 years old and more.
I would even find a news article on it, study the ever loving snot out of it, look up the details for it, then place it right on the resume, as a reminder of how it is good to have older persons working for them.