Aging affects hair loss through several biological and hormonal mechanisms that gradually alter the hair growth cycle, follicle structure, and scalp environment.

1.Slowing of the Hair Growth Cycle

As we age, the anagen (growth) phase of the hair cycle becomes progressively shorter, while the telogen (resting) phase lengthens. This results in:

• Slower hair growth
• Increased shedding
• Reduced ability to regrow hair after it falls out

Over time, fewer hairs are actively growing at any given moment

2. Follicular Miniaturization

Aging contributes to gradual miniaturization of hair follicles, particularly in individuals genetically predisposed to hair loss. Each new hair cycle produces a thinner, shorter, and lighter hair shaft, eventually leading to visibly reduced hair density.

3. Hormonal Changes

Hormonal shifts play a significant role, especially in women:

• Declining estrogen levels during menopause reduce the protective effect estrogen has on hair growth.
• Relative increases in androgen activity can further promote follicle miniaturization.

In men, lifelong androgen exposure combined with age accelerates androgenetic alopecia.

4. Reduced Stem Cell Activity

Hair follicles rely on stem cells to regenerate new hair. With aging, follicular stem cell activity decreases, impairing the follicle’s ability to re-enter the growth phase and produce healthy hair fibers.

5. Decreased Scalp Blood Flow

Aging is associated with reduced microcirculation in the scalp. Diminished blood supply can limit the delivery of oxygen and nutrients necessary for optimal follicle function and hair shaft production.

6. Changes in Hair Fiber Quality

Hair shafts become:

• Finer
• More brittle
• Less pigmented

These changes contribute to the perception of thinning even when the total hair count has not dramatically decreased.

7. Environmental Damage

Over time, cumulative exposure to UV radiation, oxidative stress, pollution, and mechanical trauma weakens hair fibers and follicular health, compounding age-related thinning.

Is Age-Related Hair Loss Preventable?

While aging itself cannot be stopped, early intervention can slow hair loss progression. Medical treatments, nutritional optimization, scalp care, and when appropriate hair restoration procedures can help preserve density and improve appearance.