I think you'll find there are no guarantees, but rather general agreement that 10 years would be on the short end of the durability scale.

The prostheses are not suited for running, or taking a lot of pounding otherwise, or heavy lifting. But they work well for everything else. Some people do run with them; I wouldn't. I would walk, hike, swim, bicycle, etc.

I'm your age, OP. One thing I can tell you from experience is that, as your hips deteriorate, you will lose more and more mobility, and your gait will change to compensate for the bad joint. For me, that meant a considerable amount of back pain from the lower thoracic spine, on down. Gait can affect your knees and feet, too. As I mentioned before, recovery was tougher with the badly deteriorated hip than the one replaced earlier in its decline.

In other words, delay might be unwise as well as unnecessary. The decision is yours, in consultation with your doctor.