"act one's age, not one's shoe size" meaning in English

{
  "etymology_text": "In reference to a person's shoe size (in the US or UK shoe size systems) usually being much lower than their age.",
  "forms": [
    {
      "form": "acts one's age, not one's shoe size",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "acting one's age, not one's shoe size",
      "tags": [
        "participle",
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "acted one's age, not one's shoe size",
      "tags": [
        "participle",
        "past",
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "acted one's age, not one's shoe size",
      "tags": [
        "past",
        "present",
        "singular",
        "third-person"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "act one's age, not one's shoe size (third-person singular simple present acts one's age, not one's shoe size, present participle acting one's age, not one's shoe size, simple past and past participle acted one's age, not one's shoe size)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "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"
        }
      ],
      "examples": [
        {
          "text": "You should act your age, not your shoe size!",
          "type": "example"
        }
      ],
      "glosses": [
        "Synonym of act one's age (“to behave in a mature manner; to avoid being childish”)."
      ],
      "id": "en-act_one's_age,_not_one's_shoe_size-en-verb-filXxD2P",
      "links": [
        [
          "act one's age",
          "act one's age#English"
        ],
        [
          "mature",
          "mature"
        ],
        [
          "childish",
          "childish"
        ]
      ],
      "raw_glosses": [
        "(idiomatic, usually imperative) Synonym of act one's age (“to behave in a mature manner; to avoid being childish”)."
      ],
      "synonyms": [
        {
          "extra": "to behave in a mature manner; to avoid being childish",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "act one's age"
        }
      ],
      "tags": [
        "idiomatic",
        "imperative",
        "usually"
      ]
    }
  ],
  "word": "act one's age, not one's shoe size"
}

{
  "etymology_text": "In reference to a person's shoe size (in the US or UK shoe size systems) usually being much lower than their age.",
  "forms": [
    {
      "form": "acts one's age, not one's shoe size",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "acting one's age, not one's shoe size",
      "tags": [
        "participle",
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "acted one's age, not one's shoe size",
      "tags": [
        "participle",
        "past",
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "acted one's age, not one's shoe size",
      "tags": [
        "past",
        "present",
        "singular",
        "third-person"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "act one's age, not one's shoe size (third-person singular simple present acts one's age, not one's shoe size, present participle acting one's age, not one's shoe size, simple past and past participle acted one's age, not one's shoe size)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English terms with usage examples",
        "English verbs",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "You should act your age, not your shoe size!",
          "type": "example"
        }
      ],
      "glosses": [
        "Synonym of act one's age (“to behave in a mature manner; to avoid being childish”)."
      ],
      "links": [
        [
          "act one's age",
          "act one's age#English"
        ],
        [
          "mature",
          "mature"
        ],
        [
          "childish",
          "childish"
        ]
      ],
      "raw_glosses": [
        "(idiomatic, usually imperative) Synonym of act one's age (“to behave in a mature manner; to avoid being childish”)."
      ],
      "synonyms": [
        {
          "extra": "to behave in a mature manner; to avoid being childish",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "act one's age"
        }
      ],
      "tags": [
        "idiomatic",
        "imperative",
        "usually"
      ]
    }
  ],
  "word": "act one's age, not one's shoe size"
}