From the discovery of DNA repair mechanisms to the rise of epigenetic clocks, longevity science has transformed how we understand ageing, disease, and human resilience. Yet in an era flooded with anti-aging promises, miracle supplements, longevity clinics, and biohacking trends, scientific certainty is often claimed faster than the evidence can support.

In this landmark work, Professor Patrick Treacy presents a compelling new framework for understanding why we age and what modern medicine can realistically do about it. Drawing on decades at the forefront of regenerative and longevity medicine, he explores the interconnected biological pathways that govern human ageing, including genomic stability, epigenetic regulation, mitochondrial function, chronic inflammation, and stem-cell regeneration.

Introducing the Treacy Model of Interconnecting Ageing Pathways, this book challenges the search for a single cause of ageing and argues instead for a systems-based understanding of biological decline. Rather than focusing on isolated interventions, Professor Treacy examines the broader network of biological systems that shape lifespan, healthspan, and human resilience.

Rigorous enough for clinicians, researchers, and healthcare professionals, yet accessible to informed patients and longevity enthusiasts, The Pathways of Ageing and Human Longevity serves as both a scientific reference and a practical guide to understanding the future of longevity medicine.

This is not the case against longevity medicine. It is the case for scientific precision. This is not a book about reversing time. It is a book about understanding it.