My 80+ yo mom has an iPad I, works fine for her. Remember, she's not compiling anything or playing Minecraft. She's just reading some web sites, playing music and light email.
The thing has been amazing - no tech support calls in years. No more LogMeIn sessions. Unless the user has a specific reason to need a newer version (some specific software, like iOS 7), then the older ones work just fine. It's still sitting on the original iOS as I don't want to change anything at this point. The chance that she will run into a security issue is pretty minimal, even with the older OS / browser. She doesn't keep credit card info on it, browses only limited sites and only emails family and friends.