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.
In the male rabbit, testicles descend as early as 10-12 weeks of age, which puts them into the teenage phase of a rabbit's life. They may be a bit too young to impregnate a female bunny (although don't count on it), but they begin to exhibit all of the bunny sexual behaviors.