Seniors are highly encouraged to wear compression socks on long flights (typically those over 4 hours) because they significantly reduce the risk of Deep Vein Thrombosis (DVT) and lower-leg swelling. As we age, circulation in the legs can become less efficient, and the prolonged immobility of air travel can cause blood to "pool" in the veins, potentially leading to dangerous clots. Compression socks work by applying graduated pressure—tightest at the ankle and loosening as they go up—which helps "push" blood back toward the heart. In 2026, medical experts generally recommend a "moderate" compression level of 15-20 mmHg for travel. However, it is vital for seniors with certain conditions, such as severe peripheral arterial disease or advanced congestive heart failure, to consult a doctor first, as the extra pressure could potentially complicate their circulation. For most healthy seniors, these socks are a simple and effective "travel hack" that prevents post-flight leg fatigue and ensures a safer journey.