@Jehan
Your Particular paper is valid for 5 years from the date mentioned on the result card (now a days it will be online). but the funda remains same. it doesnt have anything to do with your last paper's result.
for ex : Air Regulation showing date 10/07/2011 then its valid till 09/07/2016
and Navigation showing date 09/06/2009 then it is valid till 08/06/2014 .
so when you submit your papers to issue an ATPL, all the results should be with in their validity periods,
hope this helps...