Geez, stonesurf. Worn out at 45! Well at least there's plenty of great hardware out there to fix hips. I can't give you any advice from first hand experience, although I do have this relationship with an orthopaedic surgeon who tightens up my shoulders from time to time.
First, make sure you've got private health insurance, otherwise your pelvis is likely to be grinding on your kneecaps before you get a hip replacement through the public system. With a pre-existing condition, you might need to hobble out a 12 month waiting period before being covered for surgery, assuming that's what's required.
Now to the hardware. Some of my firm's clients are manufacturers of hip replacements, so I get to see info about their latest and greatest technology. Pretty cool engineering actually. Anyway, have a look at
www.zimmerbiomet.com/anz or
www.stryker.com/jointreplacements/medprof/hiphome.php Most of the stuff is made primarily from a titanium alloy, and is glued into place with an inert bone cement. They don't use just any epoxy!
When the pain does become unbearable and you get a referral to an orthopaedic surgeon, it would be his or her decision what would suit you best. But I'd be very surprised if you were advised against sailing after a hip replacement.