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For lenses specifically, every "L" I know of as well as a couple of non-L's contain an imprinted date code on the rear of the lens. Details can be found here: http://www.the-digital-picture.com/Canon-Lenses/Canon-Lens-Aging.aspx
Somebody else will have to chime in to fill you in on date codes for bodies. I would think that if you had a serial number (which might be on the box) you could possibly call Canon and find out the details associated with that serial number. I've never done that so I'm not sure what information Canon could provide.
Good luck!
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