"donkey's years" meaning in English

{
  "etymology_text": "1876 or earlier. Possibly chosen because donkeys can be long-lived animals. Despite the similarity, pre-dates and likely not directly related to donkey's ears, a less frequently used rhyming slang term for years.",
  "head_templates": [
    {
      "args": {
        "1": "p",
        "head": "donkey's years"
      },
      "expansion": "donkey's years pl (plural only)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Commonwealth English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English pluralia tantum",
          "parents": [
            "Pluralia tantum",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Irish English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1876, The Salisbury Times",
          "text": "Didn't you ask him how long it had been in his possession?\nI can't recollect that. I might have done so.\nDidn't he say for years and years and donkey's years?"
        },
        {
          "ref": "1923, The Bridgeport Telegram:",
          "text": "With a heavy make-up, you’ll be the cutest vamp I’ve seen in donkey’s years.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A long time, years and years."
      ],
      "id": "en-donkey's_years-en-noun-VObR5FFR",
      "links": [
        [
          "years and years",
          "years and years"
        ]
      ],
      "raw_glosses": [
        "(UK, Ireland, Commonwealth, idiomatic) A long time, years and years."
      ],
      "synonyms": [
        {
          "word": "donkeys' years"
        }
      ],
      "tags": [
        "Commonwealth",
        "Ireland",
        "UK",
        "idiomatic",
        "plural",
        "plural-only"
      ],
      "wikipedia": [
        "rhyming slang"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-donkey's years.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/2/29/En-au-donkey%27s_years.ogg/En-au-donkey%27s_years.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/2/29/En-au-donkey%27s_years.ogg"
    }
  ],
  "word": "donkey's years"
}

{
  "etymology_text": "1876 or earlier. Possibly chosen because donkeys can be long-lived animals. Despite the similarity, pre-dates and likely not directly related to donkey's ears, a less frequently used rhyming slang term for years.",
  "head_templates": [
    {
      "args": {
        "1": "p",
        "head": "donkey's years"
      },
      "expansion": "donkey's years pl (plural only)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "British English",
        "Commonwealth English",
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English pluralia tantum",
        "English terms with quotations",
        "Irish English",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "1876, The Salisbury Times",
          "text": "Didn't you ask him how long it had been in his possession?\nI can't recollect that. I might have done so.\nDidn't he say for years and years and donkey's years?"
        },
        {
          "ref": "1923, The Bridgeport Telegram:",
          "text": "With a heavy make-up, you’ll be the cutest vamp I’ve seen in donkey’s years.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A long time, years and years."
      ],
      "links": [
        [
          "years and years",
          "years and years"
        ]
      ],
      "raw_glosses": [
        "(UK, Ireland, Commonwealth, idiomatic) A long time, years and years."
      ],
      "tags": [
        "Commonwealth",
        "Ireland",
        "UK",
        "idiomatic",
        "plural",
        "plural-only"
      ],
      "wikipedia": [
        "rhyming slang"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-donkey's years.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/2/29/En-au-donkey%27s_years.ogg/En-au-donkey%27s_years.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/2/29/En-au-donkey%27s_years.ogg"
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  ],
  "synonyms": [
    {
      "word": "donkeys' years"
    }
  ],
  "word": "donkey's years"
}