How old were you when you first jumped in a Grand Prix compe

  The same age i won a Nobel Prize ...
I was four and a half. I rode a 16.5hh black stallion named Thunderbolt and we jumped every jump and they were like 9 'which is super high but he had wings so it was okay because we could fly over the jumps.
The great majority of us have only done that in our dreams ....... TROLLL!!!!