I went back to university to do a Masters at 28… surrounded by a mix of people most of whom were in their early 20s but with some more mature. Went back to do another Masters in my mid-40s again surrounded by much younger people. Now I’m 49 and doing a PhD. I barely see any other humans 🙂 but most of the other students are mid-20s.

It is weird, but you can find your way through it. To be honest the thing I found most difficult was having forgotten all my study skills and essay-writing skills. You could do a lot worse than revise that before you go, and there will be lots of help when you get there with all the non-academic side of things.

Socially I found that I did meet people both my own age and friends who were much younger. We were all doing the same thing at the end of the day. You have the big advantage of having worked out all those stresses and worries that people go through in their early 20s that are a massive distraction from academic work. I think you’ll find friends and fit in really well. Good luck!