Why Does Our Energy Decline As You Get Older?
Why feeling older does not have to mean feeling exhausted
By Dennis H – Former Gym Manager | Qualified Personal Trainer | Longtime Student of Evidence-Based Health and Healthy Ageing
Many people notice that they do not seem to have the same energy they had when they were younger. Everyday activities may feel more tiring, recovery can take longer and the temptation to sit down rather than get moving becomes stronger.
It is easy to assume that this is simply an unavoidable part of getting older. Age does influence how our bodies function, but it is rarely the whole explanation. Our energy levels are also shaped by physical activity, muscle strength, sleep, nutrition, stress, health conditions and medications. Some of these factors can be improved, while others may need medical attention.
Understanding the difference between normal changes and persistent fatigue can help us make better decisions about our health.
Energy Is More Than a Feeling
When we say that we have less energy, we may be describing several different things. Sometimes we feel sleepy. At other times our muscles tire quickly, our motivation is low, or ordinary tasks require more effort than they once did.
At a cellular level, the body must continually convert nutrients and oxygen into usable energy. This process does not suddenly stop working because we reach a certain age. However, changes in our cardiovascular fitness, muscle mass, sleep quality and general health can make the same activity feel more demanding.
A person may therefore feel as though the body is producing less energy when part of the problem is that the body has become less efficient at using it.
We Often Move Less as We Get Older
One of the most important causes of declining energy is also one of the easiest to overlook: we gradually become less active.
When we move less, our cardiovascular fitness declines and our muscles lose some of their strength and endurance. Walking up a hill, carrying shopping or working in the garden then requires a greater percentage of our available capacity. The task has not changed, but it feels harder because our physical reserve has become smaller.
This can create a self-reinforcing cycle. Activity feels tiring, so we do less. Doing less reduces our fitness, which makes activity feel even more tiring.
Regular walking, strength training and other appropriate physical activity can help reverse much of this decline. Exercise requires energy in the short term, but over time it improves the body's ability to produce and use energy efficiently.
Sleep Changes, but Our Need for Sleep Does Not Disappear
Older adults generally need about the same amount of sleep as other adults, but sleep may become lighter and more easily interrupted. Pain, needing to use the bathroom, medications, stress and conditions such as sleep apnoea can all reduce sleep quality.
Spending eight hours in bed does not necessarily mean receiving eight hours of restorative sleep. Poor-quality sleep can leave us physically tired, mentally foggy and less motivated to be active. That inactivity can then make it harder to sleep well the following night.
A regular sleep routine, daytime activity and addressing persistent sleep problems can make a meaningful difference. Ongoing daytime sleepiness, loud snoring or frequently waking unrefreshed should not automatically be accepted as normal ageing.
Nutrition, Blood Sugar and Hydration Matter
The body needs protein, healthy fats, carbohydrates, vitamins, minerals and water to function properly. Eating too little, relying heavily on highly processed foods, or regularly skipping meals can contribute to low energy.
Large swings in blood sugar may also leave some people feeling tired or sluggish, particularly after meals. Meals that provide a sensible balance of protein, fibre-rich foods and healthy fats generally supply energy more steadily than foods dominated by refined carbohydrates and added sugar.
Nutritional deficiencies can also play a part. Low iron, vitamin B12 deficiency and other problems may cause fatigue, but taking supplements without knowing the cause is not always the answer. A doctor can arrange appropriate tests when a deficiency is suspected.
Even mild dehydration can contribute to headaches, poor concentration and tiredness. Thirst may become less reliable with age, making regular fluid intake increasingly important, particularly during hot weather or physical activity.
Stress, Mood and Mental Fatigue
Energy is not purely physical. Ongoing stress keeps the body and mind in a state of heightened demand. Over time, that can interfere with sleep, reduce motivation and leave us feeling worn down.
Low mood and depression can also appear as tiredness, lack of interest or difficulty starting normal activities. These symptoms are sometimes dismissed as laziness or ageing, but they deserve to be taken seriously.
Rest is important, but complete withdrawal from activity often makes the problem worse. Gentle movement, regular routines, social contact and appropriate professional support can all help, depending on the cause.
Sometimes Tiredness Has a Medical Cause
A noticeable or persistent loss of energy should not simply be blamed on getting older. Fatigue can be associated with anaemia, thyroid problems, diabetes, heart or lung disease, infections, sleep disorders, depression and many other conditions.
Medications may also contribute. As people get older, they are more likely to take several medicines, and tiredness can be a side effect of some of them. Medication should never be stopped or changed without medical advice, but unexplained fatigue is a good reason to ask a doctor or pharmacist to review what you are taking.
Seek medical advice if fatigue is new, severe, worsening, interfering with normal life, or accompanied by symptoms such as unexplained weight loss, breathlessness, chest discomfort, dizziness, bleeding, persistent pain or a major change in mood.
Can We Improve Our Energy?
There is no single way to restore youthful energy, and no supplement can compensate for every possible cause. However, several fundamentals consistently help:
· Remain physically active and rebuild fitness gradually.
· Include strength training to help preserve muscle and physical capacity.
· Maintain a regular sleep routine and investigate persistent sleep problems.
· Eat balanced meals that provide adequate protein and essential nutrients.
· Drink enough fluid, especially during activity and hot weather.
· Manage ongoing stress and stay socially and mentally engaged.
· Have unexplained or persistent fatigue properly assessed.
The Bottom Line
Growing older may change how quickly we recover and how much physical reserve we have, but a major decline in energy is not inevitable. Much of what we experience is influenced by activity, fitness, sleep, nutrition, stress and overall health rather than age alone.
The answer is not to chase stimulants or accept exhaustion as our new normal. It is to look honestly at the factors affecting our energy, improve what we can and seek help when tiredness is persistent or unexplained.
Ageing may require us to pay more attention to recovery, but it does not mean we must stop feeling capable, active and engaged with life.
If a lack of energy is becoming a concern, it is worth taking an honest look at your lifestyle and considering whether changes to your activity, sleep, nutrition, hydration or stress levels could help support better energy. Small, consistent improvements may make a meaningful difference. If your energy does not improve, or you remain concerned, speak with your doctor so that any underlying cause can be properly investigated.
Disclaimer
This article is provided for general educational purposes only and should not be considered medical advice. Persistent or unexplained fatigue can have many causes. Consult your doctor or another qualified healthcare professional if you are concerned about a change in your energy levels or before making significant changes to your diet, exercise routine, medications or supplements.
Sources consulted
Australian Government healthdirect: Fatigue; Dehydration; Iron deficiency
National Institute on Aging: Fatigue in Older Adults; Sleep and Older Adults; What Do We Know About Healthy Aging?