Is dating/hanging undergrads who aren't freshman seen as weird/creepy

[PhantomThief]

I'm 22 and doing an MA in fall and was wondering as there is a good chance many students might be olde than me and I could have a hard time relating to them and since I'm closer in age to undergrads, I was curious, is it looked down upon to date/hang out with undergrads who aren't freshman? Is the lifestyle/maturity too different and will I seem like that old guy trying to hang on to his youth or is it normal?