A young sheep between newborn and 14 months old is called a lamb. Once a lamb reaches the age of 14 months old, it is considered a sheep.
An adult female sheep is known as a ewe and an adult male sheep is known as a ram. A castrated male sheep is known as a wether. There are as many as 1 billion sheep in the world as of 2011. Sheep are cherished not just for their potential meat, but also for milk and wool. The ingredient lanolin in wool is often used for cosmetic products and skin care products, to help make skin feel smooth.