QUOTE(Hobbes)
Help out a horse racing neophyte here...what is so magic about 3 year olds, though. Why can't 4 year olds, 5 year olds, etc. run? Why not wait until they're a year older? The only reason I can come up with is money...owners want more breeding years, and less cost of upkeep until racing. Given what you said above, this sounds alot like capping the age for Olympic competitors at 15 or so.
Horses do race after age 3; however, the Kentucky Derby is limited to 3-year olds. John Henry, another great race horse, really didn't reach his prime until he was 8-9 years old.
QUOTE(Cruising Ram)
They have just bred these horses to far out past the original, IMHO.
I agree. "Poodles of the equine word" is a good way to put it. In my short period of horseownership, I had a 1/2 Arab, 1/2 Quarter Horse mare and she matured at about 4 years old. She was a tough old gal. And the small Arab gelding I had was an energizer bunny of a horse at 10. I bred my mare to a purebred Arab stud from a historic bloodline, and got a stunning black filly. The stud's grandsire lived to be 35, and was covering mares nearly to the end, the old rogue. Sadly, my financial status changed, and I had to sell them all. I was saddest to see that lovely black filly go. I saw her later under saddle, and she was a beauty. Ahh, having horses was fun...lots of work (and bruises), but fun nonetheless. I was a horse-crazy kid, and still love the big beasties.
A sad note about racehorses and horses in general, is that with the economic situation, a lot of people are having to get rid of their animals because they can't afford to care for them anymore, and many are winding up in the meat auctions. Just recently, I heard of a rescue group that found a fairly successful retired racehorse at one of those auctions, and rescued him from a grisly fate. I'm sure there are many others that ran their hearts out and made money for their owners, only to end up valued only for their flesh.