Short answers, pulled from the story.
Philosopher Nikolai Berdyaev first suggested the term Silver Age to describe a specific period in Russian literary history. This label did not become common usage until the 1960s, decades after the events it describes.
Scholars now define the era as spanning from the last decade of the 1800s through the early 1920s. The death of Alexander Blok occurred shortly before 1922 and Nikolai Gumilev faced execution in 1921 following the conclusion of the Russian Civil War.
A key distinction sets this movement apart from its predecessor because female poets and writers influenced the direction of the work considerably. Mirra Lokhvitskaya published poetry that helped establish a foothold for female voices during the 1890s while Anna Akhmatova became one of the most respected figures.
Anna Akhmatova, Boris Pasternak, and Osip Mandelshtam all launched their poetic careers during this turbulent period. Alexander Blok rose to become the leading poet earning respect from virtually everyone in the field.
The death of Alexander Blok occurred shortly before 1922 and Nikolai Gumilev faced execution in 1921 following the conclusion of the Russian Civil War. These specific deaths marked the end of the era as scholars define it today due to political violence silencing many authors permanently.