Lev Stepanovich Dyomin (Russian: Лев Степанович Дёмин; 11 January 1926 – 18 December 1998[1]) was a Soviet cosmonaut who flew on the Soyuz 15 spaceflight in 1974.

[1] Aged 48 at the time of his flight on Soyuz 15, he was the oldest cosmonaut up to that point as well as the first grandfather to go into space.

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