How it is correct: years or years?
The plural of the noun "year" hastwo forms - years and years. Both options are equal, and you can use any of them. Although, most likely, you use in your speech and that, and another form.
In some combinations, one form is morefrequency in use and more familiar. For example: school years, war years, the 1920s. It is unlikely that you will say "military years", although, from the point of view of the Russian language, this is permissible.
In the works of classic authors, you can find both forms that compete with each other. Moreover, in the same work there is also a wordform of the "year" and "years":
- "This telegrake was my memory, it warmed me in hard years" (AI Solzhenitsyn Matryon Yard).
- "And the years went by as the water swam ..." (ibid.).
Many will be surprised to learn an ambiguous answer to the question of how to write and speak correctly: years or years. However, we should not forget that the Russian language is full of secrets and mysteries.