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the claim

Menstruation usually begins around the age of 11, though it can start as early as 9 years old.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
6 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that menstruation usually begins around the age of 11, though it can start as early as 9 years old?

Yes. Contemporary epidemiological studies indicate that menstruation typically begins around age 11 to 13, with a significant proportion of girls experiencing menarche at or before age 9 to 11 due to ongoing secular trends.

Verdict: SUPPORTED · 6 sources for, 0 against · Last checked

The analysis

The retrieved papers consistently demonstrate that the average age of menarche has declined globally, clustering around ages 11 to 13 in recent birth cohorts, with substantial numbers experiencing early onset around or prior to age 11. There is no evidence refuting the claim.

Evidence for · 6
A Description of Temporal Trends and Age-Period-Cohort Effects in the Association Between Age at Menarche and Adult Obesity Among Women in the United States.
2026
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CE, C., HK, B., S, G., C, K., & HR, B. (2026). A Description of Temporal Trends and Age-Period-Cohort Effects in the Association Between Age at Menarche and Adult Obesity Among Women in the United States.. doi.org. https://doi.org/10.1111/ppe.70154

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More for · 5
Secular Trend in Age at Menarche and Associated Determinants in the Valencian Population (Spain).
2026
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A, B., B, S., R, B., R, A., N, M., O, A., A, M., M, V., C, F., F, B., A, E., & MJ, L. (2026). Secular Trend in Age at Menarche and Associated Determinants in the Valencian Population (Spain).. doi.org. https://doi.org/10.1002/ajhb.70322

Secular trends in menarche age among Iranian girls: Probit analysis on cross-sectional data of Persian (Shahedieh) cohort.
2026
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S, J., R, S., N, Y., & M, K. (2026). Secular trends in menarche age among Iranian girls: Probit analysis on cross-sectional data of Persian (Shahedieh) cohort.. doi.org. https://doi.org/10.18502/ijrm.v24i6.21460

Secular trends in age at menarche and associated determinants in the Valencian population (Spain)
2026
Get citation
A, B., B, S., R, B., R, A., N, M., O, A., A, M., M, V., C, F., F, B., A, E., & M, L. (2026). Secular trends in age at menarche and associated determinants in the Valencian population (Spain). doi.org. https://doi.org/10.64898/2026.04.29.26351926

Age at Menarche Among Mizo Women in Aizawl, Mizoram: A Secular Trend Across Five Birth-Decade Cohorts (1960-2007).
2026
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L, R., L, S., L, H., B, L., C, B., & V, R. (2026). Age at Menarche Among Mizo Women in Aizawl, Mizoram: A Secular Trend Across Five Birth-Decade Cohorts (1960-2007).. doi.org. https://doi.org/10.7759/cureus.106523

Secular trends and ethnic disparities in age at menarche among ethnic minority girls in China: a 35-year nationwide repeated cross-sectional study from 1985 to 2019.
2026
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D, S., Y, L., J, D., S, C., Y, W., J, G., X, L., S, L., J, L., T, H., J, L., R, Y., Q, C., P, H., J, M., J, L., & Y, S. (2026). Secular trends and ethnic disparities in age at menarche among ethnic minority girls in China: a 35-year nationwide repeated cross-sectional study from 1985 to 2019.. doi.org. https://doi.org/10.7189/jogh.16.04221

What does the evidence say?

The retrieved papers consistently demonstrate that the average age of menarche has declined globally, clustering around ages 11 to 13 in recent birth cohorts, with substantial numbers experiencing early onset around or prior to age 11. There is no evidence refuting the claim.

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