Walter Koenig, the actor best known for playing Pavel Chekov in the original 'Star Trek' television series and its films, has died at 90, prompting renewed interest in what it takes to live a long life and remain healthy into older age.

Koenig died on 25 October at his home in North Hollywood, Los Angeles, according to reports published on 26 October. His representative, Zachery McGinnis, said the actor died of 'old age' while surrounded by his daughter and niece. No further medical details were provided.

Koenig joined 'Star Trek' in 1967 as the Enterprise's Russian navigator, becoming a familiar face to generations of science-fiction fans. Beyond the franchise, he worked as a writer and appeared in other television productions, including 'Babylon 5'.

Although reaching 90 is a significant milestone, longevity is shaped by a complex combination of genetics, environment, healthcare and lifestyle. Research into ageing increasingly focuses not only on how long people live, but also on how well they maintain their physical, mental and social wellbeing as they grow older.

What Determines How Long a Person Lives?

There is no single explanation for why some people live into their 90s while others develop serious health problems much earlier. Ageing reflects a combination of inherited traits and factors that change throughout life.

Genetics can influence susceptibility to certain diseases and how the body responds to ageing. However, genes are only part of the picture. Diet, physical activity, tobacco use, alcohol consumption, sleep, environmental exposures and access to healthcare can all influence long-term health.

The National Institutes of Health notes that healthy ageing involves managing physical, mental and cognitive health to preserve independence and quality of life. Regular medical care can also help identify and manage conditions such as high blood pressure, diabetes and cardiovascular disease, which may contribute to disability or premature death if left untreated.

Importantly, researchers cannot determine why Koenig lived to 90 from his age alone. His reported age at death does not establish that he followed any particular lifestyle or possessed specific genetic advantages.

Why Living Longer Is Not the Same as Ageing Well

Researchers often distinguish between lifespan and healthspan. Lifespan refers to the total number of years a person lives, while healthspan describes the period spent in relatively good health and with the ability to carry out everyday activities.

The World Health Organization defines healthy ageing in terms of maintaining the functional abilities that support wellbeing in older age. This includes being able to meet basic needs, make decisions, remain mobile, maintain relationships and participate in society.

Healthy ageing does not necessarily mean being free of disease. An older adult may live with a chronic condition while maintaining independence and a good quality of life, particularly when the condition is appropriately managed.

Conversely, a longer lifespan does not guarantee freedom from disability, pain or cognitive difficulties. This is why ageing research increasingly examines whether people can preserve physical function, memory and independence alongside extending life expectancy.

The distinction also helps explain why a single longevity milestone cannot tell the full story of someone's health. Reaching 90 does not reveal what illnesses a person may have experienced, how independently they lived or what their overall quality of life was.

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Which Habits Support Healthy Ageing?

Although no lifestyle can guarantee a long life, evidence supports several measures that can help reduce the risk of chronic disease and preserve function as people age.

Regular physical activity helps maintain cardiovascular health, muscle strength, balance and mobility. The NIH recommends that adults work towards at least 150 minutes of moderate-intensity aerobic activity each week, alongside muscle-strengthening activities on two or more days, with adjustments when health conditions or physical limitations require them.

A balanced diet that includes vegetables, fruit, whole grains, healthy fats and adequate protein can support general health. Nutritious eating patterns are associated with a lower risk of several conditions, including cardiovascular disease and type 2 diabetes.

Avoiding tobacco and limiting alcohol can also reduce exposure to important health risks. Smoking cessation offers health benefits even later in life, while alcohol intake should be considered in the context of individual health and its associated risks.

Consistent sleep and preventive healthcare matter as well. Regular check-ups can help people manage existing conditions, review medications and identify emerging problems. Maintaining social connections and looking after mental health are also important parts of overall wellbeing.

These habits do not eliminate the effects of ageing, and their benefits vary between individuals. Genetics, socioeconomic circumstances and access to healthcare also shape the opportunities people have to maintain their health.

Can Science Help People Live Longer?

Researchers are investigating the biological processes involved in ageing, including changes in cells, inflammation, metabolism and the body's ability to repair damage. The aim is to better understand why age-related diseases become more common and whether interventions can delay their onset.

However, claims that a supplement, diet or experimental treatment can reliably extend human life should be treated cautiously. Evidence that a particular intervention affects a biological marker or produces a benefit in animals does not automatically mean it will help people live longer.

For now, established measures such as physical activity, nutritious eating, avoiding tobacco, preventive healthcare and managing chronic conditions remain important components of healthy ageing. There is no proven routine that guarantees a person will reach a particular age.

Koenig's death at 90 marks the end of a career that made him a lasting part of television history. While his age offers a natural starting point for discussing longevity, science makes clear that ageing is individual and multifaceted. The goal is not simply to add years to life, but to support health, independence and quality of life throughout those years.

Frequently Asked Questions

  • What factors influence how long a person lives?
    Longevity is influenced by a combination of genetics, environment, healthcare, and lifestyle factors such as diet, physical activity, and access to medical care.
  • What is the difference between lifespan and healthspan?
    Lifespan refers to the total number of years a person lives, while healthspan describes the period spent in relatively good health and with the ability to carry out everyday activities.
  • What habits support healthy ageing?
    Regular physical activity, a balanced diet, avoiding tobacco, limiting alcohol, consistent sleep, preventive healthcare, and maintaining social connections support healthy ageing.
  • Can science help people live longer?
    Research is ongoing into the biological processes of ageing, but established measures like physical activity and nutritious eating remain important for healthy ageing.
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