Not sure where I heard this first, but is there any evidence of a young man from Napoleon's army being captured by the Russians and sent to a POW camp/gulag only to be forgotten about and freed by Communist revolutionaries nearly a century later?
If the person was 10 when the Grand Armée left France in 1812, he would be 115 in 1917. The oldest recorded man ever is Jiroemon Kimura, who died at 116 years, 54 days.
So, unlikely.
As /u/telkanuru suggested the timeline of events do not match up with life expectancy. Even if the "revolutionaries" are the ones from the 1905 Uprising the numbers would be beyond belief.
There still might be some truth to the story, in an article I found in The Voice of Russia, states that all POWs from Napoleon's invasion of Russia was released by Tsar decree in 1815, however there was a number of Frenchmen who stayed behind in Russia and lived out their years in Russia, never returning to France.
Just to throw another possibility out there. Could the soldier potentially be from the Crimean War?
Technically it was Napoleon's army, though Napoleon III, not his more famous relative.
War begins in 1853, figure the soldier was 18 and by the outset of the Russian revolution would have been in his 60's.
That said I have never heard of this nor do I know of any evidence, just postulating on the timeframes. Nor do I know about any kind of prisoners being kept for such a period of time. I would expect they'd be released at the end of hostilities.