Types of hip replacements

I had my left hip replaced at the age of 30, I am now 34 and have been running fairly hard on it the last month or so with no pain!  My right hip can be replaced at anytime but I am still going to train for a half marathon on Sep 17 and then have it replaced after that.  After that I am really looking forward to running with no pain for the first time in my life, my first hip replacement was a direct anterior approach to total hip arthroplasty.  It took me a while to feel real comfortable on it but I took my time, is this the best option for a replacement?  How long can I expect it to last before it wears down? It feels good and strong right now but I’m not doing 10 mile runs yet.