issue with if clauses

I have the following data:

A B C D
1/14/2013 1/1/2002 barg
1/14/2013 6/1/2012 nonbarg

and need to put a result into D as a result of the following factors:
If B is less A-5yrs and 'barg' is in C, then NA, otherwise Review and if C has 'nonbarg' always enter NA

I used * =IF(C5="barg",(IF(A5-(365*5)<B5,"NA", "Review"))) - and this works

However when I add the another clause I get the #VALUE error:
=IF(C6="nonbarg","NA","Done")+(IF(C6="barg",IF(A6-(365*5)<B6,"NA","Done")))

What an I doing wrong? Can someone help put me out of my misery? Many thanks for your attention.

Thank you for the response:

If 'nonbarg' is in column C, then the answer is always NA.
If 'barg' is in the column C, and the number of years is less than 5, the answer is NA
If 'barg' is in the column C, and the number of years is greater than 5, the answer is Done (Review) - user keeps changing her mind.

Many thanks, this works beautifully and is so much more elegant. I didn't know about the DATEDIF - so thank you also for that.