From the Research
The anagen phase of hair growth typically lasts between 2 to 7 years, though this duration varies significantly among individuals. During this active growth phase, hair follicles produce new hair cells, causing the hair to grow approximately 1 centimeter per month 1. The length of the anagen phase determines the maximum potential length of hair growth—people with longer anagen phases can grow longer hair. This phase is influenced by genetics, age, health status, and hormones. As we age, the anagen phase tends to shorten, which is why many older adults cannot grow hair as long as they once could. Certain health conditions and medications can also affect the duration of this phase.
Some key points to consider about the anagen phase include:
- The anagen phase is the active growth phase of hair growth, during which the hair grows rapidly 2
- The length of the anagen phase varies from person to person, but it typically lasts between 2 to 7 years 3
- The anagen phase is followed by the catagen (transition) and telogen (resting) phases, which together complete the hair growth cycle 4
- Understanding the hair growth cycle can help explain why hair grows to certain lengths and why some people experience different patterns of hair growth and loss 5
It's worth noting that while the provided evidence discusses various treatments for hair loss, such as minoxidil and finasteride, the question specifically asks about the duration of the anagen phase. Therefore, the focus is on the natural hair growth cycle rather than the effects of medications on this cycle. The anagen phase is a critical component of the hair growth cycle, and its duration plays a significant role in determining the maximum potential length of hair growth.