This is my brother's 5 year old lab/something (the dog, not the kid.) We have fun guessing what else she is besides lab. I think her nose is too long to be all lab.
Labs are a breed that have been way oeverbred, so they differ so much from the breed standard. And you also have show/field strains, as well as "new" colors, white, fox red, and silver. I would call her a purbred Lab.