Well 4 1/2 years is pretty good going.
The update IOS 8.0.1 which was released yesterday only effects the 6 and 6 plus which made them useless as the touch ID and network services stopped working. All other devises work fine with it although they have pulled the update asked people to download IOS8 through iTunes but they have disabled the Health app and will be fixed in the upcoming iOS 8.0.2 software update.
IOS8 has made my iPhone 4S very laggy to the point it is a pain to use.
It might just be a phone but they are replacing most items normal people use like their laptop etc so it is a big deal from some people especially paying £6-900 for them.