i'm sure the embassy will photocopy/scan each page of your passports with your photo and details on, will they notice the different birth year, i don't know your guess is as good as mine, but if they do, i'm sure they will wonder why, and is this fraud ? and unless you've got a good answer why, then maybe they will refuse your visa..
like i said who knows if they will they notice, no one can tell you what to do in this situation, you have to decide that yourself, but to get rid of the risk, maybe don't mention your old passport, or tell them it was stolen.. thats up to you to decide.. if you have other evidence to support your visa app ...
