"silver age" meaning in English

{
  "forms": [
    {
      "form": "silver ages",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "silver age (plural silver ages)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A historical period of great accomplishment in a field or a society, usually following, and not quite as favorable as, a golden age, and not unfavorable as an iron age."
      ],
      "id": "en-silver_age-en-noun-qSV7yO4S",
      "links": [
        [
          "historical",
          "historical"
        ],
        [
          "favorable",
          "favorable"
        ],
        [
          "golden age",
          "golden age"
        ],
        [
          "unfavorable",
          "unfavorable"
        ],
        [
          "iron age",
          "iron age"
        ]
      ],
      "raw_glosses": [
        "(historical) A historical period of great accomplishment in a field or a society, usually following, and not quite as favorable as, a golden age, and not unfavorable as an iron age."
      ],
      "tags": [
        "historical"
      ],
      "translations": [
        {
          "code": "ar",
          "lang": "Arabic",
          "roman": "ʕaṣr fiḍḍiyy",
          "sense": "historical period",
          "tags": [
            "masculine"
          ],
          "word": "عَصْر فِضِّيّ"
        },
        {
          "code": "eo",
          "lang": "Esperanto",
          "sense": "historical period",
          "word": "arĝentepoko"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "historical period",
          "tags": [
            "masculine"
          ],
          "word": "âge d’argent"
        },
        {
          "code": "it",
          "lang": "Italian",
          "sense": "historical period",
          "word": "etá d'argento"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "historical period",
          "word": "srebrny wiek"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "serebrjanyj vek",
          "sense": "historical period",
          "tags": [
            "masculine"
          ],
          "word": "серебряный век"
        }
      ],
      "wikipedia": [
        "silver age"
      ]
    }
  ],
  "word": "silver age"
}

{
  "forms": [
    {
      "form": "silver ages",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "silver age (plural silver ages)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with historical senses"
      ],
      "glosses": [
        "A historical period of great accomplishment in a field or a society, usually following, and not quite as favorable as, a golden age, and not unfavorable as an iron age."
      ],
      "links": [
        [
          "historical",
          "historical"
        ],
        [
          "favorable",
          "favorable"
        ],
        [
          "golden age",
          "golden age"
        ],
        [
          "unfavorable",
          "unfavorable"
        ],
        [
          "iron age",
          "iron age"
        ]
      ],
      "raw_glosses": [
        "(historical) A historical period of great accomplishment in a field or a society, usually following, and not quite as favorable as, a golden age, and not unfavorable as an iron age."
      ],
      "tags": [
        "historical"
      ],
      "wikipedia": [
        "silver age"
      ]
    }
  ],
  "translations": [
    {
      "code": "ar",
      "lang": "Arabic",
      "roman": "ʕaṣr fiḍḍiyy",
      "sense": "historical period",
      "tags": [
        "masculine"
      ],
      "word": "عَصْر فِضِّيّ"
    },
    {
      "code": "eo",
      "lang": "Esperanto",
      "sense": "historical period",
      "word": "arĝentepoko"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "historical period",
      "tags": [
        "masculine"
      ],
      "word": "âge d’argent"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "historical period",
      "word": "etá d'argento"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "historical period",
      "word": "srebrny wiek"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "serebrjanyj vek",
      "sense": "historical period",
      "tags": [
        "masculine"
      ],
      "word": "серебряный век"
    }
  ],
  "word": "silver age"
}