They asked general questions like why social work, why aging, etc. The only other question I can specifically remember them asking was what I think would be a difficult population to work with and why it would be difficult, and then they asked if I had any questions for them. Overall the interview took like 20 minutes! It was two people interviewing me in a small office, it was pretty laid back and comfortable, but I did wear nice pants and a blouse like I would to a job interview. I got there a little early and was able to talk to some current students and the chair of the department (David I think?) who all wished me luck so that helped me be less nervous!