How do I age a Nikon Lens?

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I'm looking to get the Nikkor 18-200 second hand (as its expensive new) but it came out Nov 2005 so its 5 years old now but there is a newer and better reviewed version out which is sharper, but how do I tell how old or which version? (sorry if this is obvious to Nikon users but I was Canon until I switched):cool:
 
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