Facetime between iPhone 5 and iPhone 4?

Basically my question is can you Facetime with a person with an iPhone 4 when you have an iPhone 5?

What do you need for it to work? Do you need to update to iOS 6? Do you need Internet Connection. I just need as much information as possible thanks

Yes you can. I don't think you'll need the update, the iPhone 4 will need a Wi-Fi connection, not sure if the iPhone 5 needs Wi-Fi or not.

You can FaceTime with any iPhone which supports FaceTime, such as an iPhone 4.
In terms of what you need, a basic Wi-Fi connection, (3G if Jailbroken with tweaks), and a viable contact address such as a registered number or email to use with FaceTime.

More importantly, why arent u txting me? Lol jk.

Yes you can
you can do facetime with any other ios product
the iphone 4 user also won't even have to upgrade to be able to facetime with you
and yes both of you need internet connection to be able to facetime
hope i helped.