FAFSA Simplification Act of 2019 This bill revises certain provisions related to federal financial student aid. Specifically, the bill replaces the expected family contribution metric with a student aid index used to assess a family's financial need and approximate their financial resources to contribute to a student's higher education expenses. The bill also revises the process for filing a Free Application for Federal Student Aid (FAFSA), and it removes certain eligibility requirements having to do with drug-related offenses and registration with the Selective Service System. In addition, the bill reauthorizes the Pell Grant program through FY2021 and establishes a new eligibility formula for Pell Grants. The Department of Education must conduct certain activities to educate students and their families about Pell Grant eligibility at a younger age.