"treintas" meaning in Spanish

{
  "head_templates": [
    {
      "args": {
        "1": "m-p"
      },
      "expansion": "treintas m pl (plural only)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish pluralia tantum",
          "parents": [
            "Pluralia tantum",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2015 July 9, “¡Dejad en paz a Meg Ryan!”, in El País:",
          "text": "Y ya que hablamos de cifras, continuemos con unas bastante interesantes: de ese mínimo porcentaje de mujeres que consiguen trabajo actuando en Hollywood, más de la mitad están en sus veintes o treintas, frente a la mayoría de papeles masculinos destinados a hombres de más de cuarenta.",
          "type": "quote"
        }
      ],
      "glosses": [
        "thirties"
      ],
      "id": "en-treintas-es-noun-KQBP36kw",
      "links": [
        [
          "thirties",
          "thirties"
        ]
      ],
      "tags": [
        "masculine",
        "plural",
        "plural-only"
      ]
    }
  ],
  "word": "treintas"
}

{
  "head_templates": [
    {
      "args": {
        "1": "m-p"
      },
      "expansion": "treintas m pl (plural only)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Requests for translations of Spanish quotations",
        "Spanish entries with incorrect language header",
        "Spanish lemmas",
        "Spanish masculine nouns",
        "Spanish nouns",
        "Spanish pluralia tantum",
        "Spanish terms with quotations"
      ],
      "examples": [
        {
          "ref": "2015 July 9, “¡Dejad en paz a Meg Ryan!”, in El País:",
          "text": "Y ya que hablamos de cifras, continuemos con unas bastante interesantes: de ese mínimo porcentaje de mujeres que consiguen trabajo actuando en Hollywood, más de la mitad están en sus veintes o treintas, frente a la mayoría de papeles masculinos destinados a hombres de más de cuarenta.",
          "type": "quote"
        }
      ],
      "glosses": [
        "thirties"
      ],
      "links": [
        [
          "thirties",
          "thirties"
        ]
      ],
      "tags": [
        "masculine",
        "plural",
        "plural-only"
      ]
    }
  ],
  "word": "treintas"
}