Leukemia does not have an age limit, and people of any age can develop leukemia. However, different types of leukemia have different age groups. 1. Infants and children: Acute lymphoblastic leukemia is the main type of leukemia. Acute lymphoblastic leukemia is a type of leukemia with a better prognosis. Infants and children can also develop AML, but treatment is more difficult than for acute lymphoblastic leukemia. 2. Adults: Acute myeloid leukemia is predominant. Acute lymphoblastic leukemia is also possible. Acute promyelocytic leukemia can be treated by induction of differentiation therapy such as all-trans retinoic acid, and the prognosis is generally good. Treatment of acute lymphoblastic leukemia in adults includes chemotherapy, transplantation, etc. Treatment is more difficult and drugs include cyclophosphamide and vincristine. 3. Elderly: both acute leukemia and chronic leukemia may be affected. Some elderly patients with chronic leukemia can be treated with targeted therapy, such as Vinaclat. Elderly patients with acute leukemia are more difficult to treat due to poorer health and more diseases. Regardless of any age, if abnormal test indicators are found, it is recommended to go to the hospital as early as possible to receive regular treatment. The use of drugs should be under the guidance of a physician.