"year old" meaning in Anglais

{
  "categories": [
    {
      "kind": "other",
      "name": "Locutions nominales en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Anglais",
      "orig": "anglais",
      "parents": [],
      "source": "w"
    }
  ],
  "derived": [
    {
      "word": "-year-old"
    }
  ],
  "etymology_texts": [
    "De year (« an ») et de old (« d’âge »)."
  ],
  "forms": [
    {
      "form": "years old",
      "ipas": [
        "\\ˌjɪɚz ˈoʊld\\",
        "\\ˌjɪəz ˈəʊld\\"
      ],
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en anglais",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "I’m twenty years old.",
          "translation": "J’ai vingt ans."
        }
      ],
      "glosses": [
        "An (âge)."
      ],
      "id": "fr-year_old-en-noun-tefnrgXw"
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˌjɪɚ ˈoʊld\\",
      "raw_tags": [
        "États-Unis"
      ]
    },
    {
      "ipa": "\\ˌjɪə ˈəʊld\\",
      "raw_tags": [
        "Royaume-Uni"
      ]
    }
  ],
  "word": "year old"
}

{
  "categories": [
    "Locutions nominales en anglais",
    "anglais"
  ],
  "derived": [
    {
      "word": "-year-old"
    }
  ],
  "etymology_texts": [
    "De year (« an ») et de old (« d’âge »)."
  ],
  "forms": [
    {
      "form": "years old",
      "ipas": [
        "\\ˌjɪɚz ˈoʊld\\",
        "\\ˌjɪəz ˈəʊld\\"
      ],
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Anglais",
  "lang_code": "en",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        "Exemples en anglais"
      ],
      "examples": [
        {
          "text": "I’m twenty years old.",
          "translation": "J’ai vingt ans."
        }
      ],
      "glosses": [
        "An (âge)."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˌjɪɚ ˈoʊld\\",
      "raw_tags": [
        "États-Unis"
      ]
    },
    {
      "ipa": "\\ˌjɪə ˈəʊld\\",
      "raw_tags": [
        "Royaume-Uni"
      ]
    }
  ],
  "word": "year old"
}