Can a Labradors retriever die at the age 6?

Well, depends. Labs usually live to about 12 human years, or 61 dog years. If you love and care well for a Labrador, and it has no severe or untreated health problems, it should live at least 10 years. If a Lab is abused or has poor health from nutrition, lack of exercise, etc. then who knows, maybe a labrador can pass away at the age of 6. Love and Care for your Lab :)