Add new static type customer attribute Magento 2

Add new static type customer attribute Magento 2

#File app/code/Vendor/CustomerDemo/Setup/Patch/Data/CustomerAgeAttribute.php

<?php

namespace Vendor\CustomerDemo\Setup\Patch\Data;

use Magento\Customer\Model\Customer;
use Magento\Customer\Setup\CustomerSetup;
use Magento\Customer\Setup\CustomerSetupFactory;
use Magento\Framework\Setup\Patch\DataPatchInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
use Magento\Eav\Model\Entity\Attribute\Set as AttributeSet;
use Magento\Eav\Model\Entity\Attribute\SetFactory as AttributeSetFactory;

class CustomerAgeAttribute implements DataPatchInterface
{
    /**
     * @var ModuleDataSetupInterface
     */
    private $moduleDataSetup;

    /**
     * @var CustomerSetupFactory
     */
    private $customerSetupFactory;

    /**
     * @var AttributeSetFactory
     */
    private $attributeSetFactory;

    /**
     * CustomerAgeAttribute constructor.
     * @param ModuleDataSetupInterface $moduleDataSetup
     * @param CustomerSetupFactory $eavSetupFactory
     */
    public function __construct(
        ModuleDataSetupInterface $moduleDataSetup,
        CustomerSetupFactory $eavSetupFactory,
        AttributeSetFactory $attributeSetFactory
    ) {
        $this->moduleDataSetup = $moduleDataSetup;
        $this->customerSetupFactory = $eavSetupFactory;
        $this->attributeSetFactory = $attributeSetFactory;
    }


    public static function getDependencies()
    {
        return [];
    }

    public function getAliases()
    {
        return [];
    }

    /**
     * @return DataPatchInterface|void
     * @throws \Magento\Framework\Exception\LocalizedException
     */
    public function apply()
    {
        /** @var CustomerSetup $eavSetup */
        $customerSetup = $this->customerSetupFactory->create(['setup' => $this->moduleDataSetup]);
        $customerEntity = $customerSetup->getEavConfig()->getEntityType(Customer::ENTITY);
        $attributeSetId = $customerEntity->getDefaultAttributeSetId();
        /** @var $attributeSet AttributeSet */
        $attributeSet = $this->attributeSetFactory->create();
        $attributeGroupId = $attributeSet->getDefaultGroupId($attributeSetId);

        $customerSetup->addAttribute(
            Customer::ENTITY,
            'age',
            [
                'type' => 'static',
                'label' => 'Age',
                'input' => 'text',
                //'backend' => 'Vendor\CacheDemo\Model\Customer\Source\Attribute\Backend\Age',
                'required' => false,
                'sort_order' => 130,
                'visible' => true,
                'position'  => 130,
                'user_defined' => true,
                'system'  => false
            ]
        );

        $ageAttribute = $customerSetup->getEavConfig()->getAttribute(Customer::ENTITY, 'age');

        $ageAttribute->addData([
            'attribute_set_id' => $attributeSetId,
            'attribute_group_id' => $attributeGroupId,
            'used_in_forms' => ['adminhtml_customer', 'customer_account_create', 'customer_account_edit'],
        ]);

        $ageAttribute->save();
    }
}

#File app/code/Vendor/CustomerDemo/Setup/Patch/Schema/CustomerAgeAttribute.php

<?php

namespace Vendor\CustomerDemo\Setup\Patch\Schema;

use Magento\Framework\DB\Ddl\Table;
use Magento\Framework\Setup\Patch\PatchInterface;
use Magento\Framework\Setup\Patch\SchemaPatchInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;

class CustomerAgeAttribute implements SchemaPatchInterface
{
    /**
     * @var ModuleDataSetupInterface
     */
    private $moduleDataSetup;

    /**
     * CustomerAgeAttribute constructor.
     * @param ModuleDataSetupInterface $moduleDataSetup
     */
    public function __construct(
        ModuleDataSetupInterface $moduleDataSetup
    ) {
        $this->moduleDataSetup = $moduleDataSetup;
    }


    public static function getDependencies()
    {
        return [];
    }

    public function getAliases()
    {
        return [];
    }


    public function apply()
    {
        $this->moduleDataSetup->startSetup();
        $this->moduleDataSetup->getConnection()->addColumn(
            $this->moduleDataSetup->getTable('customer_entity'),
            'age',
            [
                'type'     => Table::TYPE_INTEGER,
                'nullable' => true,
                'comment'  => 'Age',
            ]
        );
        $this->moduleDataSetup->endSetup();
    }
}