At what age does a horse typically become a yearling?

A horse typically becomes a yearling at approximately 1 year of age. This term is used to describe a horse that is between 1 year and 2 years old, which aligns with the standard nomenclature in equine terminology. The period of being a yearling represents a significant developmental phase, as the horse transitions from a foal to a more mature young horse. At this age, horses undergo considerable growth and maturation, preparing them for training and eventual entry into competitive activities. The other options denote ages that do not align with this classification; for instance, around 6 months refers to a foal stage, and 2 years signifies a horse that is no longer considered a yearling. Therefore, interpreting the age at which a horse is termed a yearling correctly confirms the answer.