cakephp - Cake PHP 2.x model validation returns error on field despite data set

I'm working with a Cake PHP 2 project and am utilising the model validation and have implemented validation into my controller

I've set up my model to contain a$validate array with my fields and some basic rules, but when validating the request data with thevalidates method, the validation is failing for some reason.

My model looks ike:

<?php

class MyModelName extends AppModel
{
        /*
        ** Model name
        */
        public $name = 'MyModelName';

        /*
        ** Table prefix
        */
        public $tablePrefix = 'tlp_';

        /*
        ** Table to save data to
        */
        public $useTable = 'some_table';

        /*
        ** Validation
        */
        public $validate = array(
        'age' => array(
                        'required' => array(
                                'rule' => 'required',
                                'message' => 'This field is required'
                        ),
                        'numeric' => array(
                                'rule' => 'numeric',
                                'message' => 'This field can only be numeric'
                        )
                )
    );
}

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And then I'm validating like this...

$data = [
    'age' => $this->request->data['age'] ?? null,
];

$this->MyModelName->set($this->request->data);

if (!$this->MyModelName->validates()) {
  $json['errors'] = $this->MyModelName->validationErrors;
  echo json_encode($json);
  exit();
}

$hop = $this->MyModelName->save($data);
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Why would$this->MyModelName->validates() always be returning false? I've checked thatage is in$this->request->data and it is, and it's absolutely a numeric value.

$this->request->data looks like the following:

{
    "age": 50
}
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