Google , The first one to provide Android Software updates to Nexus Devices now list the end-of-life (EOL) dates on its support site .
We already know that Approximate length of The Nexus Devices to get Android software updates is 18 months and Security Patch is 3 years after available on the Google store . Now Nexus owners can get exact time when their Nexus devices will stop getting software updates .
Here's the list that Google published -
Nexus 10: November 2014
Nexus 7 (2013): July 2015
Nexus 5: October 2015
Nexus 6: October 2016
Nexus 9: October 2016
Nexus 5X: September 2017
Nexus 6P: September 2017
So , its clear that Nexus 5 will not be getting Official Android N , neither is Nexus 7 ( 2013 ) . Also Nexus and Nexus 9 will get their last Android Update as Android N .
source - Google