The menstrual cycle is one of the most visible indicators of women’s reproductive health. Throughout life, it changes naturally in response to changes in the hormonal system.
Understanding what is considered normal at each stage allows a better interpretation of changes in the cycle and the detection of possible abnormalities when they arise.
The onset of the menstrual cycle: adolescence
The first period, known as menarche, usually occurs between the ages of 10 and 16. During this period, the hormonal system is still maturing and learning to coordinate with the ovaries.
For this reason, it is common for cycles to be irregular during the first two years, and they may come earlier or later. Anovulatory cycles—that is, those in which no egg is released—are also frequent at this stage.
Over time, the hormonal axis stabilises and cycles tend to become more regular.
The reproductive stage
Once the reproductive maturity is reached, the menstrual cycle usually becomes more stable. Although many people use the 28 days as a benchmark, it is considered normal for the cycle to last approximately between 21 and 35 days.
During this stage, the cycle is usually more predictable and reflects the balance of the hormonal system.
The transition to the menopause: perimenopause
Between the ages of 40 and 50, many women begin to experience gradual changes in their menstrual cycle. This transitional period is known as perimenopause.
During this phase, the following aspects may occur:
· Shorter or longer cycles than usual.
· Greater irregularity between periods.
· Changes in the amount of bleeding.
These variations are due to hormonal fluctuations and the progressive decline in ovarian function.
Menopause: the end of the reproductive stage
Menopause is clinically defined as 12 consecutive months without a period. This marks the end of the reproductive stage and usually occurs around the age of 50, although this can vary between women.
The cycle as an indicator of reproductive health
Observing how the menstrual cycle changes over time can provide valuable information about hormonal and reproductive health. Understanding these changes allows you to take consciuos decisions about family planning and approach each stage of life with greater knowledge and peace of mind.
