He went to 21 races and won 19 of them.
Secretariat won 16 races. He finished in the money in 20 of his 21 races.
He lost five. Once he was disqualified for interference, he had a fever twice, and once was found to be suffering from an abcess in his upper lip.
In unsuccessful tournaments such as the now defunct FIA sports car championship as little as 7 cars on track or as many as 80 in some races such as the Bahrain 24 hour
Racehorses begin racing at the age of 2 and can race upto the age of 12 -13 , most retire at the age of 10 or earlier through injury.