Not sure how this would work, just throwing idea out there of an older device section/subforum. iPad mini no longer cutting edge.
I've always considered iDevices as "old" when it's no longer safe to update to the newest version of iOS. iPhone 4 didn't run well with iOS 7, 5s and 5c don't run well with iOS 9 and likely iPhone 6 and 6+ will not run well with iOS 10. Hopefully that doesn't happen but we will see.