How to tell a rabbit's age? A few practical methods
Judging by the eyes: young rabbits have bright eyes and are active; older rabbits have a dull look in their eyes and move slowly.
Judging by the incisors and claws: a domestic rabbit's incisors and claws change with age. Young rabbits have white, short incisors that are neatly arranged; older rabbits have dark yellow, thick and long incisors that are not neatly arranged and are sometimes damaged. White domestic rabbits have small toes with red at the base and white at the tips. In a 1-year-old rabbit, the red and white sections of the toes are equal in length; in rabbits under 1 year old, the red is longer than the white; in rabbits over 1 year old, the white is longer than the red. For colored domestic rabbits, you can distinguish by the length and degree of curvature of the toenails. Young rabbits' are shorter, straight and flat, and hidden in the foot fur.