I tried to respond previously to your post regarding bilateral BHR's, but for whatever reason, it didn't post. I had BHR's done 3-1/2 months apart (12/18/07 and 4/4/08) by Dr. Andy Engh of Anderson Orthopaedic Clinic in Arlington, VA. I think he would have preferred to wait a little longer, but the condition of my non-operative (right) hip (which continued to deteriorate) was impeding rehab of the left hip.
I am 48 and pretty healthy in general. I'm glad I went ahead and did it. At seven months out on the left and a little over three on the right, I am biking (stationary bike) 35-40 minutes a day or walking 35-45 minutes a day, or both some days. I've started swinging a golf club again (not well yet, but at least I'm swinging).
I'm a very happy camper -- feel like my life has been given back to me -- and truly believe in this procedure or, for that matter, THR, if BHR cannot be done.
I'd be happy to speak with you, if you'd like.
At any rate, I wish you good luck and hope you have the same results I've had.