Frederick
... that the oldest jockey to win the Derby Stakes was John Forth, who rode Frederick to victory in 1829?
... that the oldest jockey to win the <a href="./Epsom_Derby" id="mwDPE" rel="mw:WikiLink" title="Epsom Derby">Derby Stakes</a> was John Forth, who rode <b id="mwDPI"><a href="./Frederick_(horse)" id="mwDPM" rel="mw:WikiLink" title="Frederick (horse)">Frederick</a></b> to victory in 1829?