Similar story here. Mine is 3 years old, and the battery is about 80% of its original capacity and the touchpad occasionally drops clicks, but otherwise it's still working great! Also the charging cable frayed, but I have plenty of those cables around.
I think I've had mine for three years now, and it's been great! I had the same issue with the touchpad button going bad, but I just replaced it and it's been great since.
