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.
A baby rabbit will start getting fur at 3 days of age and you will be able to tell what variety (color) it is, They open their eyes at 10 days and will start getting out of the nest by 2 weeks and are ready to have nest box removed by 4 weeks. (at 4 weeks it becomes a sanitation issue.)