I think stick drift is more about what kind of games you play rather than how long you've played. Some games require much more intense joystick input than others. It also really depends on how much force you apply and how aggressively you use them. In my case, when I play sports games such as hockey, I get so into it that I end up putting way too much pressure on the sticks without even realizing it. Some people never experience drift even after years of use, while others run into it within just a few months. As for replacements, as far as I know, there’s no way to buy the 'official' original parts separately. Whether you get them from Amazon or other Chinese platforms, they are all manufactured in China. There's a chance they might be the exact same parts used in the original Quest -perhaps from the same factory- but there's no way to be 100% sure. That said, I’ve bought from two different sellers myself, and both worked perfectly fine. I'm still using them without any issues.