I bought a used Kobo Touch for my son, and it's working just fine. No telling how old it is. I don't like it, myself, I prefer the Glo (also liked the Mini, the Aura HD, and the Aura). Since the Touch has the hardware home button, there are differences in how the device is used.
If you like to fiddle a lot with settings, the Kobo is a great choice. If you like to just download from the "cloud" and don't really care what the book looks like, the Kindle is great.
Reading less than 300 books over a 3 year period has nothing to do with your device getting old or not working right. I am a fiddler and am constantly loading and deleting books from my various kobos, not to mention reading hundreds every year. Your issues were more likely caused by a bad file, since a factory reset fixed it up. The battery life on my Touch is not as good as on my other devices, which may have to do with the age of the device. Batteries don't last forever. The more you use them, the more they degrade.
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