"ripe old age" meaning in English

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          "ref": "1959 February, G. Freeman Allen, “Southampton—Gateway to the Ocean”, in Trains Illustrated, page 91",
          "text": "[...] but two 1890 Hawthorn, Leslie engines, Clausentum and Ironside, lived to a ripe old age; the former was on Town Quay and Pier work until September, 1945, and the latter, ousted from the port, eked out an existence as shed pilot at Guildford until 1955.",
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      "glosses": [
        "A very old age"
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        "(idiomatic, humorous) A very old age"
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  "word": "ripe old age"
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  "lang_code": "en",
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          "ref": "1959 February, G. Freeman Allen, “Southampton—Gateway to the Ocean”, in Trains Illustrated, page 91",
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        "(idiomatic, humorous) A very old age"
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