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Vladimir Lenin died of a stoke (3rd of a series) in 1924 at age 53. How does the Soviet Union develop if he avoids the strokes and lives a substantial number of extra years--at least 5 more and up to 20 (or at least has a natural lifespan that long--death by violent means in some intraparty dispute is a fair possible outcome).
Lenin was a workaholic and didn't know when or how to rest, so while 5 to 15 additional years seems reasonable, twenty is pushing it and more than that seems unlikely. Feel free to pick your year of death within those parameters.
How does the Soviet Union develop with Lenin in control for the additional years? What impact does that have on developments up until World War II in OTL?