[MarkFL]

Using the default style on my dev site, I added the following (in red) to the postbit_legacy template:

				<dl class="userinfo_extra">
					<vb:if condition="$post['joindate']"><dt>{vb:rawphrase join_date}</dt> <dd>{vb:raw post.joindate}</dd></vb:if>
					<dt>User ID Number</dt> <dd>{vb:raw post.userid}</dd>
					<vb:if condition="$post['field2']"><dt>{vb:rawphrase location_perm}</dt> <dd>{vb:raw post.field2}</dd></vb:if>
					<vb:if condition="$post['age']"><dt>{vb:rawphrase age}</dt> <dd>{vb:raw post.age}</dd></vb:if>
					<dt>{vb:rawphrase posts}</dt> <dd>{vb:raw post.posts}</dd>	
					{vb:raw template_hook.postbit_userinfo_right_after_posts}
				</dl>

Because that block of code is already within a vb conditional depending on the existence of the userid, there was no need to wrap the additional code with the same conditional.