The Soviet Union became a gerontocracy in its final years, contributing to its collapse.
And Reagan was right: Soviet leaders had consistently died on the job.
"It doesn't matter whether it's the Soviet Union or the United States — there's always a clash" between older and younger generations, Grunewald said.
They were afraid to let it go," said Zubok, the author of "Collapse: The Fall of the Soviet Union."
And that did become a central factor in the demise of the Soviet Union."