At first, I thought you were asking about the Duralast Gold lifetime replacement pads -replaced no matter what.
I bought the Performance Friction pads at AZ about 6 years ago for my previous vehicle. At that time they had a Lifetime Warranty same as the Golds.
On a recent check about 6 months ago (see web site), the Performance Friction brand now only has a two year warranty. It cover normal wear out, but only within two years, not lifetime.
To the original poster, it will depend how long ago you bought them and if you are in their computer or have the receipt.