A few more candidates for the ranking: Peter Samson (of Expensive Planetarium fame, the background star simulation of Spacewar!, and known for his music on the PDP-1, also author of the TMRC Dictionary [0], still active with the CHM PDP-1 team) born in 1941, Ellen Kuhfeld (Minnesota Spacewar [1] for the CDC 3100 at the University of Minnesota, 1966-68) is also in her 80s.
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A few more candidates for the ranking: Peter Samson (of Expensive Planetarium fame, the background star simulation of Spacewar!, and known for his music on the PDP-1, also author of the TMRC Dictionary [0], still active with the CHM PDP-1 team) born in 1941, Ellen Kuhfeld (Minnesota Spacewar [1] for the CDC 3100 at the University of Minnesota, 1966-68) is also in her 80s.
[0] https://www.gricer.com/tmrc/dictionary1959.html
[1] https://masswerk.at/spacewar/kuhfeld/