OP said he's 46. Most docs don't want to replace hips in people that young b/c replacement hips last 20-25 years. They want to wait until you are old enough so that they won't have to replace the replacement hip.

I think that's a question for each person to ask their surgeon.

OP is 51 now.

True, every case is different, it depends on the patient and it depends on the surgeon. But the surgeons don't control the durability of the hip replacements, and so most surgeons would be very reluctant to replace the hip of a 46 y.o. or 51 year old. As always, YMMV

Back when they used metal replacement hips, I think they lasted much longer. But the metal inserts turned out to have toxic effects. The ceramic ones, as I said, tend to last 20 years or so, though it depends on factors such as how active the person is. The more active, the faster they wear out.

Doing a total hip in a symptomatic 51 year old is routine. The implants do not have a defined lifetime, in the vast majority of patients (well over 90%) the primary implant goes with them into the grave. From my perspective the optimal construct is a 36mm Delta ceramic ball on a Vitamin E stabilized highly cross linked liner. That combination has been shown to be very long wearing.