--- a/vendor/magento/module-customer/Block/Widget/Dob.php
+++ b/vendor/magento/module-customer/Block/Widget/Dob.php
@@ -252,6 +252,7 @@
                 'class' => $this->getHtmlClass(),
                 'value' => $this->getValue(),
                 'date_format' => $this->getDateFormat(),
+                'placeholder' => $this->getLabel(),
                 'image' => $this->getViewFileUrl('Magento_Theme::calendar.png'),
                 'years_range' => '-120y:c+nn',
                 'max_date' => '-1d',