"age set" meaning in English

{
  "forms": [
    {
      "form": "age sets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "age set (plural age sets)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "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": "Anthropology",
          "orig": "en:Anthropology",
          "parents": [
            "Social sciences",
            "Zoology",
            "Sciences",
            "Society",
            "Biology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An established social category or group consisting of people born during a certain time span who together move through a series of culturally defined age grades."
      ],
      "id": "en-age_set-en-noun-QHLBECSy",
      "links": [
        [
          "anthropology",
          "anthropology"
        ],
        [
          "age grade",
          "age grade"
        ]
      ],
      "raw_glosses": [
        "(anthropology) An established social category or group consisting of people born during a certain time span who together move through a series of culturally defined age grades."
      ],
      "topics": [
        "anthropology",
        "human-sciences",
        "sciences"
      ],
      "wikipedia": [
        "age set"
      ]
    }
  ],
  "word": "age set"
}

{
  "forms": [
    {
      "form": "age sets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "age set (plural age sets)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Anthropology"
      ],
      "glosses": [
        "An established social category or group consisting of people born during a certain time span who together move through a series of culturally defined age grades."
      ],
      "links": [
        [
          "anthropology",
          "anthropology"
        ],
        [
          "age grade",
          "age grade"
        ]
      ],
      "raw_glosses": [
        "(anthropology) An established social category or group consisting of people born during a certain time span who together move through a series of culturally defined age grades."
      ],
      "topics": [
        "anthropology",
        "human-sciences",
        "sciences"
      ],
      "wikipedia": [
        "age set"
      ]
    }
  ],
  "word": "age set"
}