The last years of Tchaikovsky's life were very productive. "The Queen of Spades", "The Sleeping Beauty", the symphonic poem "Manfred", the lyric opera in one act "Iolanta", Sixth Symphony this is far from the full list of his late works. The last works did not need the approval of critics. He became famous not only in Russia, but in Europe and in America.

When he was older

http://pages.cs.wisc.edu/~boris/maha/music/tchaikovsky.html