Instructions
Look into the goat's mouth and locate the eight teeth in the lower front jaw.
Analyze the size of the teeth. The first-year kid will have sharp baby teeth while a full adult will have a set of larger permanent teeth. The teeth in goats older than five may be looser, further apart, or missing.
Analyze the size and condition of the front two teeth. A goat is a second year yearling if it has lost its two middle front teeth, which have been replaced by larger permanent teeth.
Locate the teeth next to the middle pair to see whether they are baby teeth or permanent teeth. A set of permanent teeth means the goat is two to three years old.
Look at the rest of the goat's teeth to see if the goat still has a pair of baby teeth. A goat with only six permanent teeth is between three and four years old.
How to Tell the Age of Goats
A goat's age is directly linked to the state of its teeth. A quick glance at the wear and tear of the goat's front teeth will determine its stage of life. During the typical goat's lifespan of 10 to 12 years, it will have two sets of teeth --- a baby set and an adult set. One can only approximate the goat's age using this method, because factors like diet also affect tooth growth.