There are many potential answers to that, and opinions would differ. The biggest jump race is probably the Aintree Grand National, held on the first Saturday of April near Liverpool in England. The Epsom Derby, also in England, could be argued to be the biggest flat race, though there are other contenders.
Yes You are allowed to race 2 year olds
you should barrow your horse
It must be a three year old.
The Preakness Stakes is a horse race held at Pimlico Downs in Baltimore, Maryland once a year. This year on May 15th.
hockey
1 year old :)
January 11, 1937 in Cuba.
It should cost roughly 200,000 pounds per year for a race horse, maybe 12,000 for a normal horse, this includes first class stables food and training (for race horse).
The Kentucky Derby is a horse race, you would win it on a horse, specifically a three year old Thoroughbred.
Whirlaway was a slight horse, weighing only around 1025 pounds as a three year old.
The Breeders' Cup Classic Horse Race in 2008 was broadcasted on NBC. Viewers could tune in to NBC to watch the race live as it happened.
This is a matter subject to much debate. The top two horses of the century, as named by "The Blood Horse," were Man O'War and Secretariat. Both were excellent racehorses; Man O'War was only defeated once, and that was very narrowly, after what was possibly the worst race in history, while Secretariat managed to set records in the Kentucky Derby and Belmont Stakes which still stand, and managed the incredible accomplishments of winning the awards for Three Year Old of the Year, Turf Male of the Year, and Horse of the Year, all in the same year - not to mention he also won Two Year Old of the Year and Horse of the Year together, the first time any two-year-old won Horse of the Year honors. The greatest filly of all time was most likely Ruffian. Racing in 1974 and 1975, she had ten starts, taking an immediate lead and setting or tying records as she won them all. Her tragic eleventh race is a story that still captures people even today; there was a made-for-TV movie about her in 2007.