Is there an age limit for joining a sorority? Can someone maybe 25 or older join an undergraduate chapter?

Answer 1

I think you can so long as you're part of the school and taking classes (such as graduate courses). I'm extrapolating though.

We've had pledges and members to our fraternity who were in grad school (one was as old as 29) at the time, so with many fraternities it's possible. I imagine it would be true of sororities as well.