Our life announces itself with a first breath and quietly departs with the last.
Breathing is so constant that it rarely earns our attention—until it changes. Yet how we breathe, and how our lungs function over time, influences everything from energy levels to long-term health, even if this influence is often more subtle than we might assume.
A healthy adult’s lungs can hold up to six litres of air, a measure known as total lung capacity, though this varies depending on body size, sex, and fitness. Not all of that air is used in a single breath.
Even after a normal exhalation, a substantial volume of air—typically around two to three liters—remains in the lungs. This is called functional residual capacity (FRC), and it plays an essential role: it helps keep the lungs open and allows continuous exchange of oxygen and carbon dioxide between breaths.
FRC represents a balance point in the respiratory system. At this stage of the breathing cycle, two opposing forces meet—the inward elastic recoil of the lungs and the outward tendency of the chest wall to expand. Together, they create a stable resting volume that allows breathing to remain smooth and efficient. Without this baseline volume, each breath would require significantly more effort.
Over time, however, this finely tuned system gradually changes. Lung function typically peaks in early adulthood, around the mid-20s, and then slowly declines, often becoming more noticeable after the age of 30–35.
These changes reflect both structural and functional shifts. Respiratory muscles, including the diaphragm, may lose some strength. Lung tissue becomes less elastic, and small airways may narrow slightly. The rib cage can also become stiffer with age, limiting expansion.
These changes are usually gradual and may not cause symptoms in healthy individuals, but they do affect how efficiently the body exchanges gases.
Breathing patterns can also influence ventilation efficiency, although their impact in healthy individuals is often modest. Shallow, rapid breathing may reduce how effectively fresh air reaches the deeper parts of the lungs, while slower, deeper breathing can improve ventilation distribution.
However, significant air trapping is typically associated with respiratory conditions rather than normal breathing patterns. In diseases such as chronic obstructive pulmonary disease, air becomes trapped in the lungs, making it harder for fresh oxygen to enter.
Coughing plays an important protective role as the body’s mechanism for clearing mucus and particles from the airways.
With age, cough strength and airway clearance efficiency can decline, which may contribute to an increased risk of respiratory infections, particularly in older adults or those with underlying conditions.
None of these changes mean that decline is inevitable or uncontrollable. Staying physically active, avoiding tobacco smoke, and keeping vaccinations up to date can help preserve lung function and reduce risk. While the lungs do change with age, how we care for them continues to matter.
In the end, breathing is not just automatic. It is a lifelong process shaped by biology, environment, and habit.
PRO TIP
NHS suggests a calming breathing technique for stress, anxiety and panic that takes just a few minutes and can be done anywhere:
You will get the most benefit if you do it regularly, as part of your daily routine.
You can do it standing up, sitting in a chair that supports your back, or lying on a bed or yoga mat on the floor.
Make yourself as comfortable as you can. If you can, loosen any clothes that restrict your breathing.
If you’re lying down, place your arms a little bit away from your sides, with the palms up. Let your legs be straight, or bend your knees so your feet are flat on the floor.
If you’re sitting, place your arms on the chair arms.
If you’re sitting or standing, place both feet flat on the ground. Whatever position you’re in, place your feet roughly hip-width apart.
- Let your breath flow as deep down into your belly as is comfortable, without forcing it.
- Try breathing in through your nose and out through your mouth.
- Breathe in gently and regularly. Some people find it helpful to count steadily from 1 to 5. You may not be able to reach 5 at first.
- Then let it flow out gently, counting from 1 to 5 again, if you find this helpful.
- Keep doing this for at least 5 minutes.
24.04.2026.
SOURCE
https://pubmed.ncbi.nlm.nih.gov/29763183/ https://www.lung.org/lung-health-diseases/how-lungs-work/lung-capacity-and-aging https://pmc.ncbi.nlm.nih.gov/articles/PMC3825547/ https://www.nhs.uk/mental-health/self-help/guides-tools-and-activities/breathing-exercises-for-stress/ https://www.lung.ca/lung-health/lung-info/breathing
