Почему не выводится get_theme_mod()?

function folio_customizer( $wp_customize ) {

	$wp_customize->add_section('section_about', array(
		'title' => 'Section About',
		'description' => 'This is setting for ABOUT.',
		'priority' => 35,
	));

	$wp_customize->add_setting('folio_about_list_age', array(
		'default' => '',
		'transport'   => 'refresh',
		'sanitize_callback'  => 'true_sanitize_copyright'
	));

	$wp_customize->add_control('folio_about_list_age', array(
			'label' => 'Возраст',
			'type' => 'text',
			'section' => 'section_about'
	));
}
add_action('customize_register','folio_customizer');

<div class="about_list">
    <ul>
      <li>Age : <?php echo get_theme_mod('folio_about_list_age', ''); ?></li>
      <li>City: Poltava</li>
      <li>XP: 7 months</li>
      <li>Like: Bike&Books</li>
      <li>Love: Web-design</li>
    </ul>
</div>