We are coming up on 5 years but a vow renewal isn't something I thought about. One of my friends is renewing her vows for her 5 year anniversary.
ETA: I still don't know if I would do one at this point. I think there was enough attention at my wedding and don't want a big to-do for our 5 year. Maybe I'll feel differently for my 10 year anniversary. At this point, I just need to figure out a cool 5 year anniversary trip.