The reason why white deer appear old is "albinism" caused by a genetic defect that prevents the production of melanin.

White deer specifically refers to the white deer that is unique to the Shennongjia area. The white deer is a family of animals under the order Artiodactyla of the class Mammalia. It is an antlered ruminant of varying sizes. The white deer is a variant of the fallow deer. It is native to the Mediterranean area of ??Europe and is a national second-class rare protected animal.

There are about 34 species of deer in the world, and there are about 52 species in 16 genera. Cervids are characterized by having solid bifurcated horns. Generally, only males have one pair of horns, and females are hornless. They are 0.75 to 2.90 meters long and weigh 9 to 800 kilograms.

Albinism is a hereditary disease in which partial or complete loss of pigmentation occurs in the skin, hair and eyes. The current average prevalence rate in my country is 0.0513‰. This disease is a hereditary disease. It is mainly caused by the mutation of tyrosinase gene, which leads to the failure of melanosome transformation in melanocytes or the failure of melanosomes to melanize. It is more common in consanguineous marriages.

Patients with generalized albinism have milky white or pink skin all over their body, pure white, silvery white, pale white, yellowish white hair, etc. They are photophobic and have reduced vision. Ocular albinism in some cases of albinism is limited to the eyes but has normal skin and hair pigments, and has ocular symptoms such as nystagmus and significant myopia. There is currently no radical cure for this disease, and the main approach is symptomatic treatment and avoidance of strong light exposure.

Focus on prevention, prohibit incest marriage, and conduct prenatal genetic diagnosis to prevent the birth of affected children. Patients develop photosensitive dermatitis after being exposed to the sun, which is also at risk of inducing skin cancer; their eyesight suffers from decreased vision and even blindness.