I'll help you - you don't have it.
Not all iOS versions are the same for each device, regardless of whether you think you have the latest. So your 4 year old device won't be the latest and greatest iOS and have the same features as the guy sitting next to you. Worse still, you have no idea at this point what you have or don't have
I've got a 5 year old Samsung running Android 2.3 at home and can't be upgraded. But using the Apple way, I'll just flash it with a highly cut down and featureless Android 5 skin - just to show you that it does and me feel better that I'm still supported