There won’t be enough doctors to meet the booming demand for healthcare services over the next decade due primarily to the graying U.S. population, a new study claims.

The Association of American Medical Colleges detailed the shortage in a report released today that found the U.S. would face a shortage between 46,000 and 90,000 by 2025. The association said Congress must provide $1 billion in additional funding for medical graduate programs now to train more doctors.