In reply to Sherpa Sheelah:
I had my left hip resurfaced at 60, and my right hip resurfaced at 71. They were both great, I did running and climbing until last year at 77 when the left hip failed spectacularly (I'd been led to believe it would last me the rest of my life). I had an emergency total hip replacement, and I must say it's every bit as good as the resurfacing. I've been climbing indoors since then, and also some sport climbing outside up to 4+ or 5. I have made a decision not to continue running. Resurfacing has fallen out of favour in recent years, owing to problems such as my own experience, and you may not be able to get it on the NHS. You will probably be advised not to flex a total hip beyond 90deg - This is not a limitation for me as I can only flex either of them to about 90 anyway. With these considerations I see no advantage to resurfacing - the total feels every bit as good.
I wrote recently to the surgeon who did my operation to tell him how pleased I was with it, and that I was walking and climbing. He wrote back to say he was glad I was doing so well, adding "If you go climbing, please use a rope".