What do you think of the age of Shouzhu Bird

Shouzhu birds can be judged through the skin, toenails and feathers. Generally, the skin is tender, the toenails are short and the feathers are young.If it is an old bird, its skin will be rough, especially on the legs, there will be scales like keratin, and it will also be white.At the same time, the feathers of the old bird will be dim, and it looks a bit dirty, mainly because it is the result of the wind and sun exposure for a long time.