Cancer is a disease of aging. The proportion of older patients with cancer is expected to grow in the next few decades. More than half of all cancers are diagnosed in patients over 65 years. An average 65 –year-old patient has an anticipated life expectancy of 20 years. About 25% of breast cancer occurs in patients over 70 years. Diagnosis, treatment options and challenges of adjuvant treatment, role of geriatric assessment in senior patients will be discussed.