Samples of data sources for measuring this outcome:
Life expectancy increases

Data source

CDC National Center for Health Statistics U.S. Small Area Life Expectancy Estimates Project (USA LEEP)
National level resources - Scroll down to Life Expectancy files, and click on data file for United States.
CDC National Center for Health Statistics U.S. Small Area Life Expectancy Estimates Project (USA LEEP)
State level resources - Scroll down to Life Expectancy files, and click on data file for desired State.
CDC National Center for Health Statistics U.S. Small Area Life Expectancy Estimates Project (USA LEEP)
Neighborhood level resources - Scroll down to Life Expectancy files, and click on data file for desired State. Open state-level file and select desired census tract(s).