Thanks, Ravn! Note: the connector is called a 6-pin mini-DIN, and the keyboard and mouse connector pinout charts above show six pins, but some mice and keyboards are made with the (male) connector having only four pins (i.e., with the unconnected pin 2 and pin 6 missing).
Use general age categories to categorize the rabbit. This will give you a good way of starting your assessment. A young rabbit is up to 9 months of age. An adult rabbit is approximately 9 months to 4 - 5 years of age. An elderly rabbit is 4 - 5 years upwards. Some rabbits live to be 10 - 12 years of age.
Although if you are breeding them intentionally you should wait until the female is at least one year of age. Rabbits can breed as young as 12 weeks however this is really not good for them. If you absolutely have to breed your rabbit it is best to wait until they have reached at least 1 year old first for females.