As tablets age, is there a way to put a light weight o/s on them like I did with my thinkpad t61 by putting xubuntu on it? Updates have caused my ipad 3rd gen to slow down and eventually would be nice to have an o/s that is still getting updates. I understand the Mac platform is pretty locked down but does android tablets have any options? Insights?
I am sorry, but I call bullshit. I have an iPad 3 16GB and it flies with iOS 8. It runs all games on the Apple store except for Bioshock and overall it doesn't lose to the newest iPad in any way except for the weight and maybe resolution. How the hell is the iPad 3 an "old" tablet? It's very much "new" imo. The iPad 4 was just an iPad 3 with slightly better hardware, and iPad Air does have some advantages, and probably significantly more powerful, but overall, not much different.
As for Android, they are usually pretty good at restricting your tablet from the newer version of Android it cannot run well. Same goes for iPad by the way.
Once your tablet gets so sold that it cannot run the newest OS versions anymore, you are still not losing all that much. You can still browse the internet, check mail and run apps. Really newer tablets cannot do much of anything else, minus the latest games, and some special effects that come with them. If you read, you might also appreciate higher resolutions, but that has to do with hardware, not software.
So if you got an old tablet, don't bother playing with software, unless it Cyanogen Mod available. Just slap that baby in a dock and use it to update you on mail and social networks, or use it as a second screen for your PC.
Old tablets never really become "too slow" or "useless" from what I seen. This can only happen if it's allow quality, cheap chineese tablet with low grade screen and internals. But quality tablets and phones are just fine even today.
I still use the OG Samsung Galaxy S as a nightstand email notification platform, alarm clock and social network updates.