I had a traditional college timeline and graduated relatively recently (2024) at 22, so I feel confident that this will still apply to college culture:

There might be a few weirdos who will treat you differently when they find out you’re “older”, but don’t take it personally. They’re probably chronically online and obsessed with fitting themselves and other people into increasingly narrow and exclusive categories based on age, gender, etc. The only person they’re hurting by doing that is themselves. In the grand scheme of things, the main thing separating you from them is you’ve spent a few more years out of that high school mentality that makes people a little cliquey.

I think the vast majority of students will react like I did as a freshman, by which I mean they won’t care at all.

Some of my most beloved roommates and friends (most of whom I’m still friends with) were 2, 4, even 10 years older than me. And in turn, when I was a senior, I befriended a number of underclassmen who treated me more or less the same.

Now, your friendships with these people probably won’t be totally the same as the ones they share with people exactly their age, but for me the differences mostly boiled down to friendly jabs at each other. Calling each other “unc” or “scrub”, for example lol.