The Determining the Age of a Canon Lens serial number chart has been updated to include the year 2015. This chart appears to be holding out correctly (or minimally within 1 month of correct) for the latest Canon lenses I have been receiving, so I added the new year to this popular page.
Here is the page to bookmark for future reference:
https://www.the-digital-picture.com/Canon-Lenses/Canon-Lens-Aging.aspx