My whole graduating class was 30 and up, the oldest being 57. We had one young woman of 21, she was the only one who didn't pass the NCLEX! We started with some young ones, but lost them along the way.
Personally I am not sure why ageism exists for nursing classes, perhaps it's just the instructors who cannot handle "adults" questioning them. I happened to be "one of those" students who questioned tests questions that made no sense and that the instructor could not explain. I think younger students are too afraid to make waves, older students expect their instructors to have the correct answers to problems. "Read the book" doesn't work for us.
To the poster who mentioned already having a Masters in Education, of course you are intimidating. You actually know how it's done! Sadly many nursing instructors only know how to read it out of the book, but not how to break it down for comprehension. Good luck to you.....I am sure you will be great.