Ask different people this question, and you’ll get a variety of answers. Some might point to eating nutritious meals, others may say regular physical activity is key. There are those who emphasize good daily habits, and others who believe steering clear of alcohol and tobacco is the top priority.

Yet, there’s one factor that often gets overlooked — mental well-being.

Indeed, if you take a closer look at those who live exceptionally long lives, you’ll notice a common trait: a healthy psychological state. These individuals tend to be emotionally balanced, rarely express anger, maintain a cheerful outlook, and are generally pleasant to be around.

This conclusion comes not just from observation but also from solid research. A study involving 720 centenarians in Chengdu, Sichuan (China), conducted by the city’s Elderly Affairs Commission, along with a separate three-year study on 700 American centenarians, backs this up.

Why Does Mental Health Play Such a Vital Role in Longevity?

1. A Positive Attitude Strengthens the Immune System

According to the World Health Organization (WHO) and several mental health research institutions, persistent negative emotions can weaken the immune system, reduce the body’s resistance, and increase the likelihood of chronic diseases.

On the flip side, cultivating optimism and emotional resilience helps reduce the secretion of harmful stress hormones, thereby enhancing immune function.

2. Emotional Stability Supports Hormonal Balance

Our endocrine system — which includes organs such as the thyroid, ovaries, prostate, uterus, and mammary glands — is intricately linked to our overall health. Emotional stress, anxiety, and prolonged anger can disrupt hormonal balance, particularly by triggering the overproduction of cortisol, the body’s main stress hormone.

While cortisol helps us respond to emergencies in the short term, consistently high levels can damage multiple body systems over time.

3. Good Mental Health Improves Sleep Quality

Negative emotions often interfere with restful sleep. People who are in a poor mood tend to have disrupted sleep patterns, which can further affect their physical and mental well-being.

In contrast, emotionally balanced individuals who maintain a positive mental outlook tend to enjoy deeper, more restorative sleep, which is essential for healing and longevity.

4. Positive Thinking May Reduce the Risk of Chronic Disease

Many chronic health conditions — such as hypertension, type 2 diabetes, coronary artery disease, and even certain cancers — have links to prolonged emotional distress.

Those who frequently experience stress or negativity are more prone to developing these conditions. And if someone already suffers from a chronic illness but fails to manage their emotions, they may be at even greater risk of life-threatening complications.

Take high blood pressure as an example: if someone with hypertension gets overly emotional, their blood pressure may spike dangerously, leading to events like strokes or heart attacks.

The Wisdom of the Ancients

Ancient teachings have long recognized that the key to longevity isn’t just physical — it’s also emotional mastery. Without emotional regulation, we risk becoming slaves to our feelings. One of the traits that distinguishes humans from animals is the ability to reflect and control our emotions. As the old saying goes: “A cheerful heart keeps you young.”

How Can Older Adults Better Manage Their Emotions?

1. Lower Your Expectations

One of the best ways to maintain peace of mind is to set realistic expectations. The older we get, the more we may find ourselves unable to do things we once could. High expectations can often lead to disappointment, so it’s better to adopt a flexible mindset and avoid putting pressure on yourself.

2. Avoid Getting Involved in Every Matter

Many elderly individuals feel compelled to comment on family affairs, politics, or global issues. This tendency to be involved in everything can be exhausting and emotionally draining. It’s healthier for seniors to focus their attention on what truly matters — their own well-being.

3. Maintain Family Harmony

Nothing disrupts emotional peace like a dysfunctional household. If seniors aim to stay emotionally stable, they should strive to foster harmony within their families. A peaceful family atmosphere contributes significantly to personal happiness and mental clarity — both of which support a longer, healthier life.

In the end, while diet, exercise, and healthy habits are all important, emotional health may be the most underrated factor in healthy aging. By nurturing a positive mindset, staying emotionally balanced, and letting go of unnecessary stress, seniors can not only extend their lives but also greatly improve their quality of life.