I had for around 5 years a pair of in-ear wireless PowerBeats headphones... the battery life slowly degraded until I had to recharge it every couple of days listening to them for just an hour each day... and one day, just out of nowhere, the battery started lasting only 15 minutes, making them unusable.

I thought it was ridiculous that an expensive headphone needs to be thrown away after only 5 years of light usage, but there you go... if you only had your AirPods for 2 years, sounds like I had a decent run myself :)

I still bought the newer Powerbeats model because they're quite nice and I couldn't find anything similar with as good quality. The newer model's battery lasts forever (well, a couple of weeks of light usage took them to around 25%) but I know that, in a few years, it'll get to a couple of days maximum between recharges again... hopefully a bit more than the previous one with better and newer technology.