Urs Nydeggr M. D. : Born in 1941 in Bern, Switzerland. For the Study of Medicine, he attended the University of Bern. In 2022, the author concludes a 12-year part-time engagement as a medical consultant for the Medical Laboratories Dr. Risch, a Liechtenstein-based enterprise dedicated to excellence in clinical laboratory testing. Nydegger helped to establish neglected reference intervals of lab tests for the elderly. Alumnus and Professor of the University of Bern, where he was Head of the Blood Bank (1985 – 2001) and Medical Research in the Cardiovascular Department (up to 2006). Clinical education: University Hospitals of Bern and Geneva; Boards of Internal Medicine FMH and Haematology FMH. An alumnus of Harvard Medical School, Boston, MA, USA, at the Robert B. Brigham Hospital (1976 – 1978). U. Nydeggers’s scientific contributions peak with a Citation Classic on the detection of circulating immune complexes and with ABO-histo-blood type incompatible transplantation; the most frequently cited studies pertain to the biocompatibility of artificial organs.Thomas Lung Dr. rer. nat.: Born in 1966 in Bregenz, Austria. Lung became interested in the study of senescence while at the University of Innsbruck, the Institute for Biomedical Aging Research, Austrian Academy of Sciences. Since then, he has worked in Switzerland as a Laboratory Manager for Clinical Immunology, FAMH, in two private med lab service institutions. He remained interested in reference intervals of med lab tests differing according to patients' age. The SENIORLABOR study brought his interest to projects sponsored by Dr. Risch Laboratories and attended, among others, by Nydegger. The results include several peer-reviewed original scientific reports with Lung as the first author. A large part of these papers, not always referenced in our book, take part as a basis for the relevance of senescence research in the booming field of laboratory medicine. When time permitsin his routine laboratory work, Lung has extensive engagement as a speaker in postgraduate teaching.