By the time we enter our 40s, the lungs begin to undergo gradual changes that can affect breathing capacity and respiratory reserve. While some changes are a normal part of ageing, persistent cough, breathlessness or recurrent chest infections should not simply be dismissed as getting older. Experts explain why lung health deserves greater attention after 40, which everyday habits can help protect the lungs, and when screening or medical evaluation may be needed.As we enter our 40s, what natural changes occur in our lungs, and why does lung health become more important at this stage of life? As we age lung tissue elasticity declines and chest wall mechanics stiffen. From an oncology standpoint, age-related cellular damage and long-term exposure to cancer causing agents like tobacco increase cancer risk. Looking after lung health from young age builds the respiratory reserve needed to tolerate advanced medical or surgical interventions if required as you get older. What everyday lifestyle habits can help keep our lungs healthy after 40? Engage in regular aerobic conditioning exercises to maintain full breathing capacity. Reduce carcinogen exposure by avoiding active and passive tobacco smoke, and ensuring proper ventilation while cooking. using HEPA air purifiers may help to an extent. Maintain an antioxidant-rich diet to combat cellular oxidative stress.Also read: Dream Of Becoming A Footballer Or Cricketer? Cardiologists Reveal Heart-Healthy Habits For Young Athletes What are some early signs of declining lung health that people often dismiss as 'just ageing' but should actually get checked? 2 to 3 week cut off is applicable here. A persistent cough lasting over three weeks, progressive exertional breathlessness, recurrent chest infections, coughing up blood, or unexplained weight loss are red flags. This is for both smokers and nonsmokers. Early-stage lung cancers are frequently asymptomatic or subtle; ignoring these signs delays diagnosis. These symptoms are that of TB as well. So, that should be ruled out. Are there any health screenings, vaccinations, or routine check-ups that adults over 40 should consider to protect their lung health? Annual flu and once in lifetime pneumococcal vaccine prevents severe pulmonary infections. For high-risk individuals—such as heavy past or present smokers—a annual Low-Dose CT (LDCT) scan is the gold standard for early lung cancer detection, finding lesions when they are most curable. Eliminating tobacco, mitigating indoor air pollution, exercising, and maintaining balanced nutrition significantly lower cancer risk and improve overall survival outcomes.By Dr. Sandeep Nayak, Chairman of Oncology, MACS-Renova Oncology Institute, KIMS Hospital, Bangaluru