I don't think it is unsual to see people generalize when it comes to age in the animal world. It happens all the time in rural areas.

For example, in the horse world, a horse that is under two years old can still be termed a colt. In the dog world, a dog that is under two is often referred to in many circles as a pup. In fact in some competitions they can compete in the puppy division as long as they are under two.

Here deer that are born in the spring are referred to as fawns until the next spring or fall and then they fall into the yearling catagory. The yearling catagory is usually carried until the deer's second year.