Deb and Maria are the same age, each has two kids, and they live just a few miles apart. Deb, however, will live, on average, 15 years longer than Maria. This public service video from The California Endowment — narrated by George Takei — explains the discrepancy:
What determines how long we live? The surprising thing to us was that adjacent communities can have a 15 year-difference in life expectancy.