in infants 40%: at age of 70 years 60% %
||Human Homo sapiens
||Chan BY, Gill KG, Rebsamen SL, Nguyen JC. MR Imaging of Pediatric Bone Marrow. Radiographics. 2016 Oct36(6):1911-1930 DOI: 10.1148/rg.2016160056 p.1912 right column top paragraphPubMed ID27726743
|| Steiner RM, Mitchell DG, Rao VM, Schweitzer ME. Magnetic resonance imaging of diffuse bone marrow disease. Radiol Clin North Am 1993 31(2):383–409.PubMed ID8446756
||P.1912 right column top paragraph: "The red marrow appears red due to the presence of hemoglobin. It represents the hematopoietic portion of the bone marrow, with roughly 60% hematopoietic cells and 40% adipocytes. Its fat fraction increases with age, from 40% in infants to 60% by age 70 years (primary source)."