wcfm-vendor-age-from-custom-field-dob

add_action('wcfmmp_store_list_after_store_info', function($store_id) {
    $wcfmmp_addition_info_fields = wcfm_get_option( 'wcfmvm_registration_custom_fields', array() );
    if( empty( $wcfmmp_addition_info_fields ) ) return;
    $has_addition_field = false;
    if( !empty( $wcfmmp_addition_info_fields ) ) {
        foreach( $wcfmmp_addition_info_fields as $wcfmvm_registration_custom_field ) {
            if( !isset( $wcfmvm_registration_custom_field['enable'] ) ) continue;
            if( !$wcfmvm_registration_custom_field['label'] ) continue;
            $has_addition_field = true;
            break;
        }
    }
    if( !$has_addition_field ) return;
    $wcfmvm_custom_infos = (array) get_user_meta( $store_id, 'wcfmvm_custom_infos', true );
    if( !empty( $wcfmmp_addition_info_fields ) ) {
        $label = 'DOB';
        $name = sanitize_title( $label );
        $field = $wcfmvm_custom_infos[$name] ?? '';
        if($field) {
            $age = DateTime::createFromFormat('d/m/Y', $field);
            $currentDate = new DateTime();
            echo '<p class="store-phone"><i class="wcfmfa fa-birthday-cake" aria-hidden="true"></i> Age: ' . $currentDate->diff($age)->y . ' years</p>';
        }
    }
});