"18+" meaning in English

{
  "forms": [
    {
      "form": "more 18+",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most 18+",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "18+ (comparative more 18+, superlative most 18+)",
      "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": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Suitable only for adults (e.g. adult content or mature audience content); mature, age of majority."
      ],
      "id": "en-18+-en-adj-bTy~02l2",
      "links": [
        [
          "mature",
          "mature"
        ],
        [
          "age of majority",
          "age of majority"
        ]
      ],
      "related": [
        {
          "word": "NSFW"
        },
        {
          "word": "Adults Only"
        }
      ],
      "synonyms": [
        {
          "word": "🔞"
        }
      ]
    }
  ],
  "word": "18+"
}

{
  "forms": [
    {
      "form": "more 18+",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most 18+",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "18+ (comparative more 18+, superlative most 18+)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "related": [
    {
      "word": "NSFW"
    },
    {
      "word": "Adults Only"
    }
  ],
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English terms spelled with +",
        "English terms spelled with numbers",
        "English words without vowels",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Suitable only for adults (e.g. adult content or mature audience content); mature, age of majority."
      ],
      "links": [
        [
          "mature",
          "mature"
        ],
        [
          "age of majority",
          "age of majority"
        ]
      ],
      "synonyms": [
        {
          "word": "🔞"
        }
      ]
    }
  ],
  "word": "18+"
}