A sheep younger than 1 year of age (regardless of gender) is called?

The term used to describe a sheep younger than 1 year of age is "lamb." This classification is standard in the livestock industry and highlights the developmental stage of the sheep. A lamb is typically weaned from its mother at around 4 to 6 months but is still considered a lamb until it reaches the age of one year.

The other terms refer to specific categories of sheep based on age, gender, or reproductive status. A "ewe" is a female sheep that is at least one year old, while a "ram" refers to an intact male sheep over one year of age. A "wether" is a male sheep that has been castrated and can be any age, but does not apply to the identification of young sheep as specified in the question. Thus, defining a young sheep as a lamb is an important distinction within ovine (sheep) terminology.