One year old
You can't really "castrate" a female horse. Castrating has the same meaning of neutering or gelding. You castrate a stallion and you spay a mare. So basically you have a spayed mare.
It means to castrate (or cut the testicles off) a horse, being a stallion or an older (often yearling or 2-year-old) colt.
a stud is a male breeding horse. so no.
On Howrse, castrate means to remove a male horse's testicles in order to prevent reproduction and manage behavioral issues related to breeding urges. This procedure is often done to make the horse more manageable and easier to handle.
If you want to ride him... yes. You should have done it earlier if he is going to be a riding horse
Yes.
castrate is when you make a stallion from 2 to 6 yrs a gelding, in other words making it so they can't breed by doing a small surgery. castration gives the horse more skills
On Howrse, if you choose to castrate your horse, it will no longer be able to reproduce. This can affect its ability to produce offspring in the game but can also have positive effects on its behavior and performance statistics. It's important to carefully consider the decision before castrating a horse on Howrse.
Stallions or un-castrated horses are often harder to handle than geldings or castrated horses.
If it is a breeding horse, than no. But be sure when mares go into heat that they stay out of sight, and away from the mare, or the horse will go at any costs to breed. They can be dangerous, so you should castrate as soon as possible at birth.
This depends on the vet, the area you live in, any complications that result from the surgery, and so on. It probably can't be done for under $200.