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Female Reproductive Health

Perimenopause Starts at 40? Signs You Shouldn’t Ignore

Oct 6, 2025

5 min read

Written by Fluent Team

Medically reviewed by

Dr Suma Shet

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Perimenopause Starts at 40? Signs You Shouldn’t Ignore

Perimenopause is one of the natural stages in life that all women will experience as their bodies approach menopause. It is typified by hormonal fluctuations, which could lead to both physical and emotional development. To most, their onset is slow and insidious, and one would likely miss the signs of these changes as mere reflections of ageing or stress.

The average age of perimenopause is usually quoted as starting at mid forty years of age, although in some cases, early signs have been reported as early as forty or even earlier. Knowledge of what is normal, expectations, and how this transition can be managed can make women feel more ready and in control.

The given guide includes detailed information about perimenopause during your 40s, including the initial symptoms, methods for dealing with them, and the time when you should consult a professional.

At what age does perimenopause start?

Understanding the timeline

A common question is: At what age does perimenopause begin? The answer typically falls between the late 30s and early 40s. While many women begin perimenopause between the ages of 40 and 44, the exact age can vary depending on individual factors such as genetics, lifestyle, and overall health.

On average, perimenopause starts around age 45 and can last between four and eight years before menopause officially begins. This means many women spend a significant amount of time in this transitional phase.

Factors influencing when perimenopause starts

The time of perimenopause can be affected by a number of factors:

  • Genetic causes: When a woman has a mother or a sister who had an early perimenopause or menopause, there is a likelihood that she will have the same experience at almost the same age.

  • Lifestyle: Smoking, poor diet, and elevated stress levels are factors that can potentially cause hormonal changes sooner. Following simple do’s and don’ts in perimenopause —such as eating a balanced diet, exercising regularly, avoiding smoking, and managing stress—can help support hormonal balance and ease the transition.

  • Health conditions: Certain long-term health conditions can impact the production and balance of hormones, influencing the age of onset of perimenopause.

Did You Know?

Perimenopause may begin in the mid-40s, though it is possible that it can be caused by genetics and lifestyle.

Perimenopause in your 40s: What to expect?

The early 40s are a time of great transition in the lives of many women. The body may experience various changes as hormone levels fluctuate. They are entirely natural changes that can be overwhelming at times due to a lack of appropriate information and support.

Most perimenopause symptoms at 40 years include:

  • Changes in the menstrual cycle: Menstrual periods can be altered, either occurring more frequently, less frequently, or with a heavier or lighter flow than normal.

  • Sleep disorders: The inability to fall or remain asleep can arise, often associated with fluctuations in hormones and other changes in body temperature regulation.

  • Mood swings: There are mood swings in some women, which are either caused by irritability or anxiety, or which suddenly change. Fluctuating hormone levels often contribute to anxiety in perimenopause, leading to emotional ups and downs that can affect daily life and overall well-being.

  • Skin and hair alterations: Hormone levels may be altered, which can influence skin texture and patterns of hair growth.

  • Fatigue: Even with adequate rest, fatigue can be apparent.

  • Memory lapses: At this stage, some individuals may experience forgetfulness or a lack of concentration.

Quick Explainer

Certain long-term health conditions can impact the production and balance of hormones, influencing the age of onset of perimenopause.

Early signs of perimenopause you shouldn’t ignore

The symptoms of perimenopause are usually mild in nature, but the ability to identify them can be of help in ensuring that the transition is effective.

Key early symptoms include:

  • Irregular intervals: Fluctuation in time, length, or course of the menstrual cycle is typically one of the most common indicators.

  • Sleep disturbances: Insomnia or sleep disturbance.

  • Mood and emotional changes: Excessive nervousness, sensitivity and mood swings during perimenopause.

  • Physical alterations: Changes in the body temperature, skin texture, or body composition.

  • Varying energy levels: Intermittent or unaccounted fatigue that can influence daily activities.

Quick Fact

Fluctuation in time, length, or course of the menstrual cycle is typically one of the most common indicators.

When to talk to a doctor?

Perimenopause is a natural and expected part of ageing. While many symptoms can be managed through lifestyle changes, it’s important to seek professional advice when needed. Some symptoms may require further assessment or medical support to ensure proper care.

It is advisable to see a medical professional in case of:

  • Rapid alterations of menstruation.
  • Symptoms with a devastating effect on quality of life or emotional well-being.
  • Fears about bone health or cardiovascular health, or reproductive health.
  • History of early signs of menopause or hormone-related disorders in the family.

Managing symptoms if you’re in early perimenopause

Though perimenopause cannot be prevented, the effects can be controlled through careful lifestyle decisions. Such strategies are aimed at sustaining general well-being, alleviating suffering, and assisting the body to navigate this transition.

Ease symptom lifestyle interventions

  • Balanced nutrition: A healthy diet will also help in hormonal balance, bone density, and increase energy levels.

  • Physical activity: Working out regularly helps keep the heart healthy, reduces stress, and keeps muscles and bones strong.

  • Stress management: Emotional strain can be alleviated through relaxation methods such as meditation, deep breathing, or yoga.

  • Sleep hygiene: Rest can be enhanced by forming a routine bedtime schedule and creating of a relaxation sleep environment.

  • Open communication: Emotional support may be provided by speaking to the partners, family members, or friends about your experience.

Final thoughts: Trusting your body’s timeline

Perimenopause is an extremely subjective experience. The average age of the perimenopause phase is around 45 years; however, it may occur prior to or after this age, depending on heredity, lifestyle, and other aspects. It can be a less stressful process when one is aware of the indicators of the occurrence of changes and when one requires advisory assistance.

When you start to become aware of the natural rhythm of your body, make informed choices, you might discover that you can get through this phase of life without fear or any other feeling that may be threatening.

Frequently Asked Questions

1. What is the typical age of perimenopause?

The average age of perimenopause is mid-40s, although it can start earlier on especially in women with some genetic predispositions or those affected by lifestyle issues.

2. What are the early signs of perimenopause?

Common early signs include irregular periods, mood swings, sleep disturbances, and hot flushes.

3. What is the duration of perimenopause prior to menopause?

The perimenopause phase of life typically lasts four to eight years, but this duration is highly variable among different individuals.

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