Menstrual periods are arriving earlier for younger generations, especially among racial minority and lower-income individuals Latest Science News — ScienceDaily

The average age at menarche — the first menstrual period — has been decreasing among younger generations in the U.S., especially those belonging to racial minorities and lower socioeconomic statuses, according to a new study. It also found that the average time it takes for the menstrual cycle to become regular is increasing.