Why the Elderly Are More Vulnerable to Flu and COVID-19

Research published in March 2026 indicates that older adults are significantly more likely to become seriously ill from the flu or COVID-19 due to the behavior of aging lung cells. These cells can drive excessive immune responses, which increases the risk of severe illness in the elderly population.

This biological mechanism helps explain why respiratory viruses often result in more critical outcomes for older individuals. Data cited by PMC shows that the majority of critically ill COVID-19 patients are elderly, with approximately 50% of those patients being over 60 years old.

Risk Factors for Severe Respiratory Illness

The Centers for Disease Control and Prevention (CDC) identifies older adults as a primary group at increased risk for severe illness caused by respiratory viruses, including COVID-19, flu, and respiratory syncytial virus (RSV).

Generally, people at higher risk of severe illness from respiratory viruses are Older adults Young children People with certain medical conditions, including People with weakened immune systems People with disabilities Pregnant women

Centers for Disease Control and Prevention (CDC)

While these viruses can make any person sick, the presence of specific risk factors—such as age or underlying medical conditions—increases the probability of developing severe complications.

Prevention and Treatment Protocols

In guidance updated on August 18, 2025, the CDC stated that vaccination is the most important tool for the prevention of respiratory illnesses and their potentially serious complications.

For individuals at higher risk, or those who spend time with high-risk individuals, the CDC recommends taking proactive steps to reduce risk and seeking healthcare promptly if symptoms appear.

Prompt medical attention is essential for those who feel sick or test positive for a respiratory virus. Treatment options for COVID-19 and the flu may be available to shorten the duration of the illness and make symptoms less severe.

According to the CDC, these treatments must be started within a few days of when your symptoms begin to be effective.

The National Institute on Aging further emphasizes the importance of getting a flu shot and understanding the differences between the flu, the common cold, and COVID-19 to ensure proper care and prevention for older adults.