Yoga class for an old person in Philly?

I haven't done yoga in quite a while. I used to really like it. I know that if I did it regularly, I'd help preserve my mobility as I age. I dropped out of my last yoga class because it was too crowded, and also a bit fast paced. Any suggestions for a class here that would help my flexibility, energy level, and peace of mind? I'm located in Queen Village.