Long hair

Long hair is a hairstyle where the hair on the head grows to a considerable length. The definition of "long" can change based on culture or gender. For instance, shoulder-length hair might be called short for a woman but long for a man.

In many cultures, long and lustrous hair is viewed as an attractive trait. This attraction is sometimes linked to trichophilia, a form of hair partialism. This group represents about 7% of the population and often shows devotion to very long hair.

To understand how hair grows, we must look at the hair cycle. This cycle consists of the anagen, catagen, and telogen stages. The anagen is the active growth period. It typically lasts between 2 and 7 years. At any given time, about 85% of a person's hair strands are in the anagen phase. The maximum length a person can reach depends on the duration of this phase. The fibroblast growth factor 5 (FGF5) gene helps regulate this cycle. Scientists have found that blocking the FGF5 gene can extend the cycle. This results in less hair fall and increased growth.

Cosmetologists use specific terms to categorize hair length based on where it ends. These stages include chin length, shoulder length, and mid-back level. Other categories include waist length, hip length, and classic length. Classic length reaches almost to the buttocks or upper thighs. Even longer styles include thigh-length, knee-length, and ankle or floor length.

Growing hair is a slow process. It generally takes two years to reach the shoulders. It takes approximately seven years to reach the waist or hips.

Biologically, long head hair served as a vital survival trait for early humans. Hominids likely lost most body fur 2.5 to 3 million years ago. This occurred as they moved from forests to the open savanna. This change allowed for faster running and hunting near the equator. However, head hair remained to provide thermal insulation for the scalp. It protects against ultraviolet radiation (UV) and aids in cooling through sweat evaporation.

Furthermore, hair length can serve as a biological cue for health. Because hair grows slowly, it reveals a person's nutritional status over 2 to 3 years. Severe malnutrition or vitamin deficiencies can change hair color or cause hair loss.

History shows that hair length often signals social status or identity. In ancient Greece, long hair symbolized wealth and power.

Many Greek gods, such as Zeus and Apollo, were depicted with long hair. Greek soldiers sometimes wore their hair long to show they were aristocrats. Some warriors used a style called a mullet, cutting the front short but leaving the back long. Others may have used a ponytail to keep hair manageable during battle. In contrast, Roman history shows that Julius Caesar ordered the long hair of the Gauls to be cut short after his conquest.

During the Middle Ages, hair length helped distinguish social classes. In parts of Europe, short hair often signified the peasantry or those in servitude. Long hair was frequently associated with freemen, such as the Merovingians.

In Ireland, the Gaelic people took great pride in their long hair. The English used hair length to judge allegiance during colonization. Cutting hair short could mean a person was forsaking their Irish heritage. Similarly, in the English Civil Wars, hair length identified political groups. The Cavaliers wore long hair, while the Roundheads wore shorter hair.

In modern times, hair length continues to be a tool for cultural expression. In the 1960s and 1970s, long hair became a major trend among Western youth.

Today, it is more common for women to wear long hair than for men. Studies show a correlation between hair length and age, as younger women often have longer hair. People even participate in long hair contests to showcase extreme growth. Xie Qiuping holds the record for the longest documented hair in the world as of May 2004.