Aging changes in the lungs

How breathing and gas exchange change

When you breathe in, air travels through the airways to small air sacs called alveoli. Oxygen passes from these sacs into nearby blood vessels, while carbon dioxide moves from the blood into the lungs to be breathed out. Flexible airways, supporting tissues and breathing muscles keep this exchange working.

With age, bones become thinner and may change shape, altering the ribcage and limiting its movement. The diaphragm, the main breathing muscle, can weaken. Moving enough air in and out may then require more effort, contributing to fatigue or breathlessness.

The tissues that hold airways open can lose support, allowing airways to close more easily. Air sacs also lose their normal shape. Air may become trapped, and the transfer of oxygen into the blood and removal of carbon dioxide may become less effective.

Breathing control and protection

The brain’s automatic control of breathing may become less effective. Nerves that trigger coughing can also become less sensitive, making it harder to clear inhaled particles, smoke and germs.

At the same time, a weaker immune response can make lung infections harder to fight. Recovery after smoke or other harmful exposures may be slower. These changes combine rather than acting independently.

Problems that become more likely

Older people have a greater risk of pneumonia, bronchitis, low oxygen levels and shortness of breath. Abnormal breathing patterns, including pauses during sleep known as sleep apnea, also need attention. These risks do not mean that every older person will develop lung disease.

Notice a change in your usual activity tolerance or breathing pattern. New breathlessness should not be explained away as age alone.

Everyday ways to support breathing

• Avoid smoking and secondhand smoke. Both damage lung tissue and accelerate age-related decline.
• Keep physically active within your abilities. Regular movement helps maintain respiratory function and the muscles involved in breathing.
• Break up long periods of sitting or lying down. Immobility allows mucus to collect and increases infection risk, particularly after surgery or during illness; follow your care team’s advice about safe movement.

When to seek help

Discuss persistent cough, reduced exercise tolerance or observed pauses in breathing during sleep with a healthcare professional. A proper assessment can distinguish age-related changes from treatable disease.

• Sudden or severe breathing difficulty requires urgent medical help, especially with chest pain, confusion or blue lips.
• Arrange assessment for new or worsening breathlessness rather than waiting for it to become your usual pattern.