"of a certain age" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "fr",
        "3": "d'un certain âge",
        "nocap": "1"
      },
      "expansion": "calque of French d’un certain âge",
      "name": "cal"
    }
  ],
  "etymology_text": "Perhaps a calque of French d’un certain âge.",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "of a certain age",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "of a certain age",
      "name": "en-PP"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "English euphemisms",
          "parents": [],
          "source": "w"
        },
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          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Age",
          "orig": "en:Age",
          "parents": [
            "Human",
            "Time",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "a lady of a certain age",
          "type": "example"
        },
        {
          "ref": "1989, Graham Lyle, Albert Hammond (lyrics and music), “I Don't Wanna Lose You”, in Foreign Affair, performed by Tina Turner",
          "text": "Women of a certain age / They learn to rely and your job is responses / Having played the mating game",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Middle-aged or older."
      ],
      "id": "en-of_a_certain_age-en-prep_phrase-SAHv4rCK",
      "links": [
        [
          "Middle-aged",
          "middle-aged"
        ]
      ],
      "raw_glosses": [
        "(euphemistic, chiefly of a person) Middle-aged or older."
      ],
      "raw_tags": [
        "of a person"
      ],
      "synonyms": [
        {
          "word": "geriatric"
        },
        {
          "word": "long in the tooth"
        },
        {
          "word": "on in years"
        },
        {
          "word": "elderly"
        }
      ],
      "tags": [
        "euphemistic"
      ]
    }
  ],
  "word": "of a certain age"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "fr",
        "3": "d'un certain âge",
        "nocap": "1"
      },
      "expansion": "calque of French d’un certain âge",
      "name": "cal"
    }
  ],
  "etymology_text": "Perhaps a calque of French d’un certain âge.",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "of a certain age",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "of a certain age",
      "name": "en-PP"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English euphemisms",
        "English lemmas",
        "English multiword terms",
        "English prepositional phrases",
        "English terms calqued from French",
        "English terms derived from French",
        "English terms with non-redundant non-automated sortkeys",
        "English terms with quotations",
        "English terms with usage examples",
        "en:Age"
      ],
      "examples": [
        {
          "text": "a lady of a certain age",
          "type": "example"
        },
        {
          "ref": "1989, Graham Lyle, Albert Hammond (lyrics and music), “I Don't Wanna Lose You”, in Foreign Affair, performed by Tina Turner",
          "text": "Women of a certain age / They learn to rely and your job is responses / Having played the mating game",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Middle-aged or older."
      ],
      "links": [
        [
          "Middle-aged",
          "middle-aged"
        ]
      ],
      "raw_glosses": [
        "(euphemistic, chiefly of a person) Middle-aged or older."
      ],
      "raw_tags": [
        "of a person"
      ],
      "synonyms": [
        {
          "word": "geriatric"
        },
        {
          "word": "long in the tooth"
        },
        {
          "word": "on in years"
        },
        {
          "word": "elderly"
        }
      ],
      "tags": [
        "euphemistic"
      ]
    }
  ],
  "word": "of a certain age"
}