How long do Pure Bred English Labradors live?

Average life span of a Lab is about 10 to 12 years (not counting those euthanized in shelters). Many live to 15 or 16 though. Good breeding, general care and diet are all factors in life span. Here is the breed parent club to find out more about the breed and good breeding and care and the three after that are information and resources for finding a good quality diet (any switch should be very slow), you would have to find and provide your own veterinary and general care. :-).
www.thelabradorclub.com www.dogfoodanalysis.com 
www.bornfreeusa.org 
www.terrificpets.com
www.wildheirlabradorrescue.org 
members.tripod.com 
www.wonderpuppy.net
www.petfinder.com