Hi Scrowe
Sounds like your Dad is in great condition.
I am sure if he is in good health that he can have a hip replacement. I don't think they will give him a resurfacing, but certainly he can have a THR which would get him out of pain and active again.
Usually they don't give resurfacings for people older than 70s. It is really based on his bone density not his age. You need to get him to an experienced hip resurfacing surgeon and find out what options he can have. They don't often give older people MOM thrs because they have to be really active to keep them lubricated or they start to squeek. I know of of older man that due to back problems, was not able to be active and walk and his MOM hip really squeaks.
That doesn't mean your father should stay in pain. It sounds like he needs some new hips. I just heard of a 100 year old lady that just had a THR revision and is back to being active again.
Age is not the determing factor in getting new hips. YOu need to find a doctor that will give him some new hips. Look at my list and make some phone calls.
http://www.surfacehippy.info/listofdoctors.php You will more likely find a doctor willing to help that is very experienced.
The reason I suggest calling the really experienced hip resurfacing surgeons is that they also do THRs and are trained to do more difficult surgeries than the normal orthopedics. Resurfacing is a much more difficult surgery and the doctors performing them are normally really good. So they are willing to do more difficult surgeries whether they are THRs or BHRs.
Where do you live?
Pat