How old is Katie horse?

I do not have access to real-time information, including personal details like the age of horses named "Katie."

To find out the age of a specific horse named Katie, you would need more information about that horse, such as:

* Where she lives: Is she your horse, a friend's horse, or a famous horse?

* Any identifying details: Does she have a unique markings or a registration number?

If you have more details, you might be able to find information about her age online or through a horse registry.