"fifties" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes de noms communs en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "fifty",
      "ipas": [
        "\\ˈfɪf.ti\\"
      ],
      "tags": [
        "singular"
      ]
    }
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "related": [
    {
      "word": "50s"
    },
    {
      "word": "’50s"
    }
  ],
  "senses": [
    {
      "form_of": [
        {
          "word": "fifty"
        }
      ],
      "glosses": [
        "Pluriel de fifty."
      ],
      "id": "fr-fifties-en-noun-oBs3xkBD"
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Calendrier en anglais",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "décennie"
        }
      ],
      "glosses": [
        "Années 50, en particulier la décennie 1950-1959."
      ],
      "id": "fr-fifties-en-noun-8-j2EhGj",
      "topics": [
        "chronology"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en anglais",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Exemples en anglais à traduire",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "She is in her fifties."
        }
      ],
      "glosses": [
        "Âges de 50 à 59 ans."
      ],
      "id": "fr-fifties-en-noun-5ZIftfvH",
      "raw_tags": [
        "Avec un adjectif possessif"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈfɪf.tiz\\"
    }
  ],
  "synonyms": [
    {
      "word": "1950s"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "fifties"
}

{
  "categories": [
    "Formes de noms communs en anglais",
    "anglais"
  ],
  "forms": [
    {
      "form": "fifty",
      "ipas": [
        "\\ˈfɪf.ti\\"
      ],
      "tags": [
        "singular"
      ]
    }
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "related": [
    {
      "word": "50s"
    },
    {
      "word": "’50s"
    }
  ],
  "senses": [
    {
      "form_of": [
        {
          "word": "fifty"
        }
      ],
      "glosses": [
        "Pluriel de fifty."
      ]
    },
    {
      "categories": [
        "Calendrier en anglais"
      ],
      "form_of": [
        {
          "word": "décennie"
        }
      ],
      "glosses": [
        "Années 50, en particulier la décennie 1950-1959."
      ],
      "topics": [
        "chronology"
      ]
    },
    {
      "categories": [
        "Exemples en anglais",
        "Exemples en anglais à traduire"
      ],
      "examples": [
        {
          "text": "She is in her fifties."
        }
      ],
      "glosses": [
        "Âges de 50 à 59 ans."
      ],
      "raw_tags": [
        "Avec un adjectif possessif"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈfɪf.tiz\\"
    }
  ],
  "synonyms": [
    {
      "word": "1950s"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "fifties"
}