query: How old was Heinz Steinitz when he died?
passage: Heinz Steinitz
Heinz Steinitz (April 26, 1909 – April 28, 1971, Hebrew: היינץ שטייניץ‎) was a senior Israeli marine biologist and herpetologist, Professor and Chairman of the Department of zoology at the Hebrew University in Jerusalem. He laid the foundation for research and teaching in marine biology and oceanography in Israel. In 1968 he founded the Marine Biology Laboratory of the Hebrew University near Eilat, serving as its first director. He also served as a founding member of the Zoological Society of Israel and a co-founder of the Society for the Protection of Nature in Israel.
passage: Heinz Hitler
Heinz attended an elite military academy, the National Political Institutes of Education (Napola) in Ballenstedt/Saxony-Anhalt. Aspiring to be an officer, Heinz joined the Wehrmacht as a signals subofficer with the 23rd Potsdamer Artillery Regiment in 1941, and he participated in the invasion of the Soviet Union, Operation Barbarossa. On 10 January 1942, he was ordered to collect radio equipment from an army post. He was captured by Soviet forces and was tortured to death at the Butyrka military prison in Moscow, aged 21.