Sixty percent of all cancer diagnoses and 70% of all cancer mortality occurs in patients age 65 and older. Patients older than age 65 years have an 11-fold increased cancer incidence and a 16-fold increase in cancer mortality in comparison to those younger than 65 years. The population at risk is growing rapidly: the number of adults age 65 years and older is expected to double in the next 30 years. In order to adequately care for this growing population of older adults, oncologists need an assessment tool that provides information regarding an older individual's "functional age" rather than just "chronological age." The Geriatric Assessment Tool developed by Hurria and colleagues has been found to help identify those older adults who are more vulnerable to complications from cancer treatment.