From Teens to Menopause: How Age and Obesity Affect Menstrual Health

Using data from 165,668 cycles across 12,608 US women, this study shows menstrual cycle length shortens with age until 50, then lengthens, and varies by ethnicity and BMI. Asian and Hispanic women, and those with obesity, tend to have longer, more irregular cycles. Findings confirm age-related trends and highlight subtle demographic differences for better menstrual health insights.