because it is a popular sport!
and most sports in the olympic games are popular
London Olympics
To win the Equestrian you have to have the most points for dessage,jumping and eventing.
Equestrian.
Equestrian
the Olympics (eventing)
Galen Spencer was the oldest to receive equestrian medal.
Partial answer: The ages of the riders representing the United States in Beijing are given with their bios on the website 2008 Olympics Equestrian Cheat Sheet, http://www.theequinest.com/2008-olympics-equestrian-cheatsheet/
because it requires physical exertion
No.
equestrian jumping
equestrian events
In the stadium.