Cancer is a disease that occurs more frequently in later life, and the proportion of cancers that occur in the elderly is increasing relative to younger age groups. By 2030, over 70% of all cancers are expected to occur in people aged over 65 years. Proposed mechanisms for the increased incidence of cancer in the aging population include an accumulation of genetic and cellular damage, prolonged exposure to carcinogens, and fundamental changes in the host environment. The presence of age-related physiological changes in elderly patients, presents clinicians with challenges that require specific knowledge of geriatric oncology.