You horse has to be 2 years and 6 months.
Howrse.com is a site where you can breed your own horses and sell them.
You can't - it's irreversible
on your horse's page press feed and select the amount that your horse needs then press feed again
When you pasture your horse overnight he wakes with replenished energy and morale.
There is actually an average for how old a horse is for each breed (because the life span for each breed is different) but I breed Arabians and we had an old mare, she lived to be 34. Sounds ancient, I know!
About 3 years old
About 2 and a half years old. (on average)
it depends on its breed and how old it is
At 2-3 years of age a horse will reach sexual maturity, thus able to breed.
You buy one in an auction or a trade in the "Trade" tab.
Answer for Howrse: An infection of a part of the horse's hoof called the Frog
That depends on the breed of the horse for e.g. A Lipizzaner can live up to and over 30 years old and still perform. Every breed has a different life span.