靛颏 How do you look at age

The age of 现 is generally reflected in its paws. The skin on the paws is rough, the colors look dull, and the toenails are old birds, and the color of the old bird's feather is often compared with ammonia nitrogen, which is not as bright as young birds.During the young bird, its skin is also tender, it looks very thin, there are no white marks on it, and the toenails of the paw will not be very long.