What exactly is {exp:pagination}?
Is that a 3rd party add-on maybe?
If so then that won’t be supported here and you’d need to go to the developer with any problems with that although you don’t have the required {categories} pair around your code so it’s never going to work.
If you do this does it work?
{exp:channel:entries channel="site" dynamic="yes" limit="1" require_entry="yes"}
{if no_results}
{redirect="404"}
{/if}
<h2>Who</h2>
<h4>{title}</h4>
<p>{exp:pagination paginate="bottom"}</p>
<p>{body}</p>
<p>{categories}<br />
{if category_id == "64"}<br />
{share_your_story}<br />
{/if}<br />
{/categories}<br />
{extended}</p>
<p>{simplepaginate}</p>
<p><div id="pagination"><br />
{all_pagination_links}<br />
</div></p>
<p>{/simplepaginate}<br />
{/exp:pagination} </p>
<p>{/exp:channel:entries}
If not then try this instead :
{exp:channel:entries channel="site" dynamic="yes" limit="1" require_entry="yes"}
{if no_results}
{redirect="404"}
{/if}
<h2>Who</h2>
<h4>{title}</h4>
<p>{categories}<br />
{if category_id == "64"}<br />
{share_your_story}<br />
{/if}<br />
{/categories}</p>
<p>{exp:pagination paginate="bottom"}</p>
<p>{body}</p>
<p>{extended}</p>
<p>{simplepaginate}</p>
<p><div id="pagination"><br />
{all_pagination_links}<br />
</div></p>
<p>{/simplepaginate}<br />
{/exp:pagination} </p>
<p>{/exp:channel:entries}
One of those should hopefully work for you. Also I noticed that you have your {body} field inside the pagination tags which is a little odd. Any reason for doing things in this way?
Best wishes,
Mark