As Americans discuss the issue of income inequality in an election year, a new study says rich people will live up to 15 years longer than poor ones. A rich 40-year-old man in the United States can expect to live until about 87. A poor 40-year-old man might only live until 73. The difference in length of life as it relates to income is part of a new study published in the Journal of the American Medical Association. The Health Inequality Project studied about 1.4 billion income tax records from a 15-year period ending in 2014. While people might have guessed that wealth allows for a longer life, the study reviewed more data than any similar studies in the past. Vermont Senator Bernie Sanders is running for the Democratic Party nomination. He often talks of the gap between rich and poor in the United States. Rich people have better access health care than poor people, and that can increase their lifespan.