"young at heart" meaning in English

{
  "forms": [
    {
      "form": "more young at heart",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most young at heart",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "young at heart"
      },
      "expansion": "young at heart (comparative more young at heart, superlative most young at heart)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Age",
          "orig": "en:Age",
          "parents": [
            "Human",
            "Time",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Having the joy and vitality associated with younger people, despite one's own advanced age."
      ],
      "id": "en-young_at_heart-en-adj-Yr3ZvX42",
      "links": [
        [
          "joy",
          "joy"
        ],
        [
          "vitality",
          "vitality"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) Having the joy and vitality associated with younger people, despite one's own advanced age."
      ],
      "tags": [
        "idiomatic"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "having joy and vitality associated with younger people",
          "word": "sydämeltään nuori"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "having joy and vitality associated with younger people",
          "word": "jeune de cœur"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "having joy and vitality associated with younger people",
          "word": "jung im Herzen"
        },
        {
          "code": "ja",
          "lang": "Japanese",
          "roman": "ki ga wakai",
          "sense": "having joy and vitality associated with younger people",
          "word": "気が若い"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "having joy and vitality associated with younger people",
          "word": "młody duchem"
        }
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-young at heart.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/3/30/En-au-young_at_heart.ogg/En-au-young_at_heart.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/3/30/En-au-young_at_heart.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "young at heart"
}

{
  "forms": [
    {
      "form": "more young at heart",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most young at heart",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "young at heart"
      },
      "expansion": "young at heart (comparative more young at heart, superlative most young at heart)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English terms with audio links",
        "en:Age"
      ],
      "glosses": [
        "Having the joy and vitality associated with younger people, despite one's own advanced age."
      ],
      "links": [
        [
          "joy",
          "joy"
        ],
        [
          "vitality",
          "vitality"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) Having the joy and vitality associated with younger people, despite one's own advanced age."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-young at heart.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/3/30/En-au-young_at_heart.ogg/En-au-young_at_heart.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/3/30/En-au-young_at_heart.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "having joy and vitality associated with younger people",
      "word": "sydämeltään nuori"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "having joy and vitality associated with younger people",
      "word": "jeune de cœur"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "having joy and vitality associated with younger people",
      "word": "jung im Herzen"
    },
    {
      "code": "ja",
      "lang": "Japanese",
      "roman": "ki ga wakai",
      "sense": "having joy and vitality associated with younger people",
      "word": "気が若い"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "having joy and vitality associated with younger people",
      "word": "młody duchem"
    }
  ],
  "word": "young at heart"
}