Add age message

src/components/ProfilePage/AgeMessage.jsx

@@ -0,0 +1,22 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { UncontrolledAlert } from 'reactstrap';
+
+function AgeMessage({ accountURL }) {
+  return (
+    <UncontrolledAlert color="info">
+      <h6>Your profile cannot be shared.</h6>
+      <p>
+        To share your profile with other edX learners,
+        you must confirm that you are over the age of 13.
+      </p>
+      <a href={accountURL}>Set your date of birth</a>
+    </UncontrolledAlert>
+  );
+}
+
+AgeMessage.propTypes = {
+  accountURL: PropTypes.string.isRequired,
+};
+
+export default AgeMessage;