Understanding the Science of Longevity

Longevity has become one of the biggest conversations in health. But living longer isn't the goal on its own. The real focus is healthspan – staying healthy, energetic and resilient as we age.

Research increasingly points to one thing: healthy ageing starts at a cellular level.

What is longevity?

Longevity refers to how long we live, while healthspan is the number of years we spend in good health.

Although genetics play a role, everyday habits like nutrition, sleep, exercise and stress management all influence how our bodies age.

The aim isn't to stop ageing. It's to support the biological processes that help us age well.

Why do our cells matter?

Every organ, muscle and tissue in your body is made up of cells.

Each day, your cells produce energy, repair damage and replace old tissue. As we age, these processes naturally become less efficient, which can affect everything from energy levels to cognitive function and skin health.

Healthy cells create the foundation for a healthier body.

The role of mitochondria

Inside every cell are mitochondria, often called the powerhouses of the cell.

Their job is to produce ATP, the energy that powers almost every function in the body.

As we get older, mitochondrial function naturally declines. Supporting mitochondrial health has therefore become one of the biggest areas of longevity research.

You can learn more about cellular energy in our guide to Cellular Ageing.

Why is NAD+ important?

One molecule that has received significant scientific attention is NAD+.

NAD+ is involved in cellular energy production, DNA repair and healthy mitochondrial function.

Research shows that NAD+ levels naturally decline with age, which is why scientists continue to study its role in healthy ageing.

Read more about NAD+ and cellular health in our related article.

What supports healthy ageing?

There isn't a single solution for longevity.

Instead, healthy ageing is built through small, consistent habits that support your cells every day.

These include:

• Eating a nutrient-rich diet
• Exercising regularly
• Prioritising quality sleep
• Managing stress
• Supporting overall cellular health

Together, these habits create the environment your body needs to repair, adapt and function at its best.

The long game

Longevity isn't about quick fixes.

It's about making consistent choices that support your health over time.

While research continues to evolve, one message remains clear: the health of your cells plays a central role in how you age.

Looking after them today can help support your wellbeing for years to come.

References

López-Otín C, et al. The Hallmarks of Aging. Cell. 2013.

López-Otín C, et al. Hallmarks of Aging: An Expanding Universe. Cell. 2023.

Verdin E. NAD+ in Aging, Metabolism, and Neurodegeneration. Science. 2015.

Lautrup S, et al. NAD+ in Brain Aging and Neurodegenerative Disorders. Cell Metabolism. 2019.