I'm 34 on an access course mostly full of people in their early 20's
On a course of 20 people, I talk with everyone, and frequently with about 8 people, the oldest of which is 25, the youngest are 20. I'm the oldest on my course by 5 years.
There is no prejudice from any of them about my age. Now I don't know if my classmates are comparable to your own. And you and I are also likely very different people so my experience isn't going to translate directly to your own. But if you can come to terms with age only being an issue if you make and let it be an issue, then you can at least move past it and deal with whatever other obstacles you're facing.
From my experience, I have typically been the one to engage my other classmates. I don't know if they would have still approached me, I didn't wait to find out I got stuck in and got to know people. If your age gap is obvious you have to understand, they may think you're not interested in socialising with a bunch of kids, they might think they're just giving you the space you want.