Determine age of iPhone unit

hardware iphone

This website seems to be able to retrieve some information about Apple devices from the serial number.

There is also this website.

Related

MacBook Pro 13" (2009): No startup-chime, no error sounds, internal screen stays black
Is tree view available in Finder in Lion?
Limiting different users on a single machine to different connectivity
Can't change displays refresh rate
How to reformat the latest iMac?
What is the command sent by the home button on iPad bluetooth keyboards?
How to know if a SSD will work on OS X?
Launch Dictation With Applescript
Camera will not work in Skype in 10.8.5
Switching apps based on where user looks
Why can't I log in to Messages using my preferred Apple ID
Can I change the color of the folders in iOS7? [duplicate]