List of Famous people who are 73

Elizabeth Helen Blackburn, is an Australian-American Nobel laureate who is the former President of the Salk Institute for Biological Studies. Previously she was a biological researcher at the University of California, San Francisco, who studied the telomere, a structure at the end of chromosomes that protects the chromosome. In 1984, Blackburn co-discovered telomerase, the enzyme that replenishes the telomere, with Carol W. Greider. For this work, she was awarded the 2009 Nobel Prize in Physiology or Medicine, sharing it with Greider and Jack W. Szostak, becoming the first Australian woman Nobel laureate. She also worked in medical ethics, and was controversially dismissed from the Bush Administration's President's Council on Bioethics.

Dr. Pentti Ilkka Olavi Arajärvi is a Finnish Doctor of Law, Professor Emeritus and Docent of the University of Helsinki, a former civil service official and a Social Democratic politician from Helsinki. Arajärvi was awarded the honorary title of valiokuntaneuvos for his work in parliamentary committees. He is the spouse of Tarja Halonen, who was the President of Finland between 2000 and 2012.

Tibor Cservenyák is a Hungarian former water polo player who competed in the 1972 Summer Olympics and in the 1976 Summer Olympics.