How does the skin's turnover cycle change with age?

Generally, in the 20s, it is about a 28-day cycle, but it extends with aging. In the 40s, it is about 45 days, and after the 50s, it can extend to about 55 to 75 days.

Why is it necessary to reassess skincare after the 30s?

Because the turnover cycle slows down with age, leading to more skin issues such as dullness, dryness, and fine lines. It is important to reassess and strengthen hydration and exfoliation care according to age.

What were the main results of the awareness survey conducted by IC Clinic?

72.8% mistakenly believed the turnover cycle is 28 days, and 83.0% were unaware that the cycle can double with age.

What is the role of the stratum corneum?

It is the outermost layer of the skin, about 0.02mm thick, and it serves as a barrier to protect the skin from external stimuli and to retain moisture by preventing water evaporation.

What are the recommended skincare routines by age?

In the 30s, focus on enhancing hydration. In the 40s, prioritize exfoliation and whitening care. After the 50s, low-irritation and high-hydration care is recommended.

[Time Day x Skin Time Survey] 72.8% Believe Turnover is 28 Days; 83.0% Unaware Cycle Doubles with Age

Published Jun 10, 2026 6:00 PM ・ Updated Jun 14, 2026 7:11 AM ・ 4 min read ・ Source: PR TIMES

I-See Clinic conducted a survey on skin turnover for 'Time Day.' Findings reveal that 80% are unaware that turnover slows with age, mistakenly believing it remains a fixed 28-day cycle.

Conclusion: Status of Skin Turnover Skin turnover is not a fixed 28-day cycle. It extends with age, lasting approximately 28 days in one's 20s, 45 days in one's 40s, and 55–75 days after 50. Consequently, skincare routines must be reassessed from the 30s onwards to account for this slowdown. Key measures include moderate exfoliation, intensive moisturizing, and rigorous UV protection.

### Key Survey Findings - 72.8% mistakenly believe skin turnover is a 28-day cycle. - 83.0% are unaware that the cycle can change by more than double depending on age. - Only 31.7% have adjusted their skincare routine since reaching their 40s.

Glossary ### What is Skin Turnover? It is the metabolic cycle where cells generated in the basal layer are pushed up to the stratum corneum and eventually shed as dead skin. While typically around 28 days for those in their 20s, it lengthens due to aging and lifestyle habits.

### What is the Stratum Corneum? The outermost skin layer, approximately 0.02mm thick. It handles barrier protection and moisture retention. If thickened due to irregular turnover, it causes dullness and roughness.

### What is the Basal Layer? The deepest layer of the epidermis, where new cells are created via cell division.

Turnover by Age and Skincare Recommendations - 20s (Approx. 28 days): High sebum production, prone to skin issues. Needs proper washing, moisturizing, and UV care. - 30s (Approx. 35–40 days): Prone to dryness and fine lines. Recommends moisturizing reinforcement and starting anti-aging care. - 40s (Approx. 45–55 days): Dullness, roughness, and visible dark spots. Requires exfoliation, brightening, and thorough moisturizing. - 50s and beyond (Approx. 55–75 days): Weakened barrier function, prone to dryness and sagging. Recommends low-irritation care with high moisturizing and nutritional replenishment.

Survey Overview - Participants: 300 men and women nationwide in their 20s–60s interested in skincare. - Period: May 25 to June 3, 2026. - Method: Internet-based survey.

FACT BOX

Source: PR TIMES
Category: Survey

[Time Day x Skin Time Survey] 72.8% Believe Turnover is 28 Days; 83.0% Unaware Cycle Doubles with Age

Glossary ### What is Skin Turnover? It is the metabolic cycle where cells generated in the basal layer are pushed up to the stratum corneum and eventually shed as dead skin. While typically around 28 days for those in their 20s, it lengthens due to aging and lifestyle habits.

Survey Overview - Participants: 300 men and women nationwide in their 20s–60s interested in skincare. - Period: May 25 to June 3, 2026. - Method: Internet-based survey.

FACT BOX

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[Time Day x Skin Time Survey] 72.8% Believe Turnover is 28 Days; 83.0% Unaware Cycle Doubles with Age

Glossary ### What is Skin Turnover? It is the metabolic cycle where cells generated in the basal layer are pushed up to the stratum corneum and eventually shed as dead skin. While typically around 28 days for those in their 20s, it lengthens due to aging and lifestyle habits.

Survey Overview - **Participants**: 300 men and women nationwide in their 20s–60s interested in skincare. - **Period**: May 25 to June 3, 2026. - **Method**: Internet-based survey.

FACT BOX

Editorial & Verification Standards

FAQ

Cite this article — HOW TO CITE

AI CRAWLER ACTIVITY

Survey Overview - Participants: 300 men and women nationwide in their 20s–60s interested in skincare. - Period: May 25 to June 3, 2026. - Method: Internet-based survey.