I got an iPhone 4s when it first came out and I still have it and it still looks the same as the day as it came out of the box. I of course have also had a protector on it from day 1, although I've had a few different kinds. I'm finally going to upgrade within the next couple months to a 6. Even though I'm tiring of Apple products, sadly every single person I know and speak to has one, and it is therefore both financially and practically best to have one as well.
Oh, and I chose Kevin more because when given the chance to Moore, you should Moore.