Lung function peaks in the mid-twenties and declines slowly afterwards. That is true of lifelong non-smokers who exercise daily. Knowing the normal shape of that curve is what makes it possible to notice when something is off it.
Three things change
The chest wall stiffens. Rib joints and costal cartilage lose flexibility, so expanding the chest takes marginally more work. Loss of bone density can compound this, since changes to spinal shape reduce the room available.
Elastic recoil falls. Healthy lung tissue springs back to push air out. That recoil diminishes over time, so slightly more air stays behind after each breath.
The diaphragm weakens. It is a muscle and it follows the same rules as every other muscle. It is also the change most responsive to staying active — which is the practical point of this whole article.
What that feels like
For most healthy people, very little. The respiratory system carries substantial reserve, and the gradual decline usually stays comfortably inside it. You might notice a steep hill is more work than it was at thirty, or that recovery after exertion takes a bit longer. That is the expected picture.
The immune side, which gets less attention
The immune system answers a chest infection more slowly than it used to, which is the reason influenza and pneumonia sit heavier on older patients and the reason the recommended vaccine list grows with each decade. Measured in consequences rather than physiology, this probably outweighs everything in the section above — and unlike stiffening ribs, there is something concrete to do about it.
What genuinely helps
- Keep moving. Aerobic activity maintains how efficiently your body extracts and uses oxygen. The real risk is the deconditioning spiral — less activity, more breathlessness, less activity — not the ageing itself.
- Train the diaphragm. Diaphragmatic breathing, where the belly rises rather than the chest, targets the most trainable component. Five minutes a day rebuilds a pattern most adults have partly lost.
- Learn pursed-lip breathing. In through the nose for two, out through pursed lips for four. Pulmonary rehab teaches it because the slight back-pressure holds small airways open a moment longer during exhalation.
- Stay current on vaccinations. Ask what is recommended for your age rather than assuming nothing has changed.
- Stopping smoking still pays at any age. Even after decades, the downward slope flattens once you quit. The honest yardstick was never a return to never-having-smoked; it is the path ahead of you with cigarettes against the path without them, and at seventy that comparison still comes out one way.
Where a supplement sits
Modestly, and below everything above. No supplement reverses age-related changes in lung tissue, and any product claiming to restore lung function is making a measurable claim it cannot support — you now know it would show up on a spirometry test. A daily botanical routine is a reasonable addition to the list. It is not a replacement for any item on it.
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