As a breeder, I keep track of breeding dates, duedates, and birth dates. All of the rabbits are "aged" basedon birth date.
A rabbit is known as a Kit until it is weaned and leaves it's mom(about 6-8 weeks of age.) Then it's known as a Junior until it reaches6 months of age. Beyond that it's considered a Senior (thoughreally it does not have to be old like the name Senior would assume, itjust means it has reached adulthood).
It's so much easieron apet owner to purchase from abreeder - it helps when it comes to destinct questions about thatparticular rabbit. Breeders are able to go back generationsand tell what traits are known in that line, and be able to give anexact age of the bun and show you it's parents as a size reference forwhen it reaches adulthood. JMO.
~Sunshine