Well sure, that’s like saying that in two years he can check his own discs and if they are still holding up, that his discs just lasted two years. If they are holding up after a couple of years, they could end up only lasting a few months more, or a few decades more. Obviously if they go a couple of years with little change, it’s a very good sign, but the adhesives could still fail soon thereafter, UV light can degrade the dye, humidity level fluctuations or storage conditions can cause warping, jitter levels may continue to elevate to the point of unreadable discs (even with low PIF levels I’ve had discs that were unreable from jitter alone), etc.
I’ve used a lot of different media types, from TY to very cheap Chinese media. I have lots of generic chinese media (Infosmart media codes, Anwell, ‘Media ID’, Longten, etc) that I burned more than 2 years ago that has not degraded at all, while some of my supposedly better media (Ritek G03) has degraded greatly. I also have old CMC R01 2.4x burns that burned with PIF totals around 100-300, they have not degraded at all after more than two years, despite them supposedly being junk according to self-proclaimed experts. While the cheap chinese media didn’t burn great initially as some Ritek had, it has remained stable. But then others have had no problems with Ritek G03 degrading, it’s impossible to say with any certainty what the future holds with anyone’s discs.
Do your best to get the best initial burn quality out of your discs, test them after burning, and take proper care and storage of the discs. Some media is much more sensitive to improper storage conditions, but if you store your discs properly all but the most notoriously troublesome discs (Ritek G05? Princo?) will likely hold up for several years at the least.