Hey Scott, you bring up something we've all dealt with. I put mine off by a good five years, for no other reason than that I wasn't 'bad enough'. I was encouraged in this by my doctors, since they all have that old time religion about deferring it and living with the pain.
The thing is that you know and we all know it doesn't improve. It gets worse every day, sometimes in small increments and sometimes in large; with me it wasn't a gradual decay, it was small and then went bad fast.
I went from a very active martial artist, soccer player, basketball player, man about town to a stilted, cranky and depressed fellow who had trouble walking up and down stairs. I stubbornly hung on to soccer even when my left hip started dislocating (I'd pop it back in and keep running), but gave up everything else.
The things I gave up weren't just activities. I became more withdrawn, lost sleep (was down to about two hours per night by the end), and could see the concern in my kid's faces when I walked.
I took my girls on a vacation to the old country (Ecuador) a year before my surgeries and was in continual pain since we were walking everywhere. My cousins, who I hadn't seen in a while commented on my slowness and weight gain, which I had to chuckle at and take, since no one really sees the open wound you have inside of you.
So outside of the personal challenges and fears that we all have had (they are normal), I also became aware of the toll it was taking on my family to see the pain I was in. The surgery and recovery will take a bit, but you are functional to the basic level you want to be at fairly quickly, then the whole thing improves.
You want to run with your kids, not just when they are teenagers but I loved running around with my girls when they were two, three. I think you stand a good chance of doing that.
As to the longevity, nothing is guaranteed, especially since we are at the forefront of this procedure still, but all indications from the Australian registries are that for all surgeons and devices (both good and bad), after 10 years the survival rate without revision is 94-96%. The curve is fairly flat at that point, so the projections I would see is that the survival rate would continue high. Just my opinion ( I'm not a medical person).
Surgeon selection is very important, so if you know you've chosen a good one, that increases that rate. Again, no guarantees but one thing you are guaranteed is that left alone, this disease gets worse.
That's my take on it, and after two years, I can tell you that it is the best thing I've ever done for myself, and I no longer see that scrunched look on my daughter's faces when they see me walk. Now they just bust me like all good young adult daughters should bust their old dad.
Good luck, just my 2 cents.