Possibly
All Triple Crown races are restricted to 3 year olds only.
It's for 3 years old horses
They are 3 years old. All horses are officially a year older every January 1st. So, regardless of the date of their birth, the Triple Crown races are for 3 year olds.
This can't be answered unless you give a list of horses.
Belmont Racetrack is a mile and a half long; the horses race a complete circuit around it to make the Belmont Stakes the longest race in the Triple Crown.
Rolled oats, corn, triple crown
Winning the Triple Crown with three different horses is an exceedingly rare achievement in horse racing. The odds are influenced by various factors, including the quality of the horses, the competition, and the jockey's skill. While no jockey has won the Triple Crown with three different horses, only a few jockeys have even managed to win it once, making this feat exceptionally difficult. Overall, the likelihood is extremely low, given the complexities of racing and the rarity of the Triple Crown wins themselves.
He out rode all the other horses.
No horse has ever won the Triple Crown twice because they can only race in the Triple Crown races as three year olds.
Not the US Triple Crown. But he did win the UK Triple Crown.
Because the Kentucky Derby is for horses classified as three years old. This means they can only run once, when they are three years old.
Barbaro, Big Brown. There's more but I can't remember them.