Ages at menarche and menopause: Some mediaeval authorities

Area of Science:

• Human biology
• Anthropology
• Demography

Background:

• The age of menarche, the first menstrual period, has varied historically.
• Previous studies indicate significant shifts in menarcheal age over centuries.

Purpose of the Study:

• To analyze historical trends in the age of menarche.
• To document changes in female reproductive timing over the last two centuries.

Main Methods:

• Review of historical demographic and clinical data.
• Synthesis of findings from anthropological and statistical surveys.

Main Results:

• Average age at menarche declined from 17.5 years in the late 18th century to 12-14 years by the mid-20th century.
• A consistent decline of approximately four months per decade since 1830 has been observed.
• Menarcheal age was stable at around 14 years in classical antiquity until approximately 1500 AD.

Conclusions:

• The age of menarche has shown a significant downward trend over the past 200 years.
• This trend suggests substantial changes in female maturation and reproductive health over time.