Here's why:
* Horse Lifespan: Horses can live for 25-30 years, so a 7-year-old is considered an adult.
* Maturity: Horses reach sexual maturity around 2-3 years old, so a 7-year-old is well past that stage.
* Physical Development: While a 7-year-old may still be physically developing, they are generally fully grown by this age.
Terms for young horses:
* Foal: A horse less than one year old.
* Yearling: A horse between one and two years old.
* Weanling: A young horse that has been weaned from its mother's milk.