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People under 20 years old had menstrual cycles 30.3 days long on average, 1.6 days longer than the 28.7-day average for those 35 to 39 years old. People 40 to 44 and 45 to 49 years old had shorter cycles, averaging 28.2 and 28.4 days, respectively.
September 2023: The Apple Women's Health Study is helping us characterize menstrual cycles throughout people's lives. In this visual series, we aim to help you understand two key concepts at the heart of the study, cycle length and variability, and how they vary between participants of the study.
14 Μαρ 2022 · Has your menstrual cycle length changed? Lots of factors can impact whether your cycle is shorter or longer than usual. Here, we’ll show you how to calculate menstrual cycle length and investigate the reasons your menstrual cycle can become shorter or longer.
28 Μαΐ 2024 · In your 30s, you can continue to expect regular menstrual cycles lasting 23 to 35 days,4 with a period generally lasting three to seven days within that span of time. Just like in your 20s, be mindful of a cycle that is longer than 38 days or shorter than 24 days, or a period length that varies more than seven to nine days month to month.5
27 Αυγ 2019 · The aim of this study is to describe menstrual cycle characteristics observed from a large database of cycles collected through an app and investigate associations of menstrual cycle...
In terms of longer cycles, 90 days is the longest cycle that we consider. Clinical guidelines suggest seeing a doctor if you ever go more than 90 days without a period. We have defined a "short" cycle as less than 24 days, and a "long" cycle as longer than 38 days.
It's important to understand how much variability you should expect in your cycle so that you know when it might be time to talk to your doctor. Cycles that are unusually long (longer than 40 days) or are very irregular can be linked to health conditions that need attention.
