More than 100,000 younger Australians will be tracked across their lifespans in a major new health study investigating the alarming surge in early-onset cancers and chronic mental health disorders.
The independent, not-for-profit Sax Institute officially launched the "18 and Up" study this week, establishing what is slated to become Australia’s largest intergenerational investigation into health, wellbeing, and ageing. The Guardian Australia reported that the ambitious research program seeks to follow participants aged between 18 and 45 throughout their adult lives to pinpoint the biological, environmental, and social drivers behind modern health conditions.
The initiative arrives at a critical juncture for the domestic healthcare system, with clinicians grappling with unexplained rises in complex conditions among demographic groups previously deemed low-risk.
Tracking an Emerging Public Health Crisis
Public health experts have grown increasingly alarmed by the sharp escalation in psychiatric conditions and early-onset malignancies among young adults. Rates of anxiety, severe depression, and psychological distress have surged over the past decade, placing immense strain on primary care and community support services.
Simultaneously, oncologists across the country have reported disturbing increases in early-onset cancers, particularly colorectal and gastrointestinal tumours, in individuals under the age of 50. While lifestyle factors, dietary shifts, sedentary behaviour, and environmental exposures have been floated as potential contributors, definitive causal links remain elusive.
By observing 100,000 individuals over multiple decades, researchers hope to capture changes in physiology, environment, and lifestyle well before clinical diagnoses occur, offering unprecedented clarity on disease pathways.
Expanding on the Landmark 45 and Up Model
The 18 and Up initiative serves as a natural successor and companion to the Sax Institute’s world-renowned 45 and Up study, which began recruitment nearly two decades ago. That initial project enlisted more than 250,000 people aged 45 and older, yielding thousands of peer-reviewed findings and profoundly altering how Australian health authorities manage cardiovascular disease, preventative screening, and aged care.
By lowering the entry threshold to include young adults, the new cohort allows epidemiologists to examine intergenerational trends. Researchers will be able to cross-reference data across families, observing how parental health behaviours, genetic predispositions, and shared household environments influence outcomes in the next generation.
Unlocking Data to Shape Health Policy
The prospective cohort will provide ongoing self-reported data via comprehensive health questionnaires, which will be integrated with administrative datasets such as Medicare, the Pharmaceutical Benefits Scheme, and state hospital admission registries.
This integrated approach provides an objective, granular view of healthcare utilisation, prescription patterns, and chronic disease management. Governments and medical authorities are expected to lean heavily on the findings to allocate health expenditure more effectively and design early interventions.
A Lifelong Commitment to Preventive Care
The recruitment drive will span urban, regional, and remote communities across the nation to ensure the sample reflects Australia’s diverse socioeconomic and cultural fabric. Participation will be entirely voluntary and conducted largely through digital platforms to sustain engagement across decades.
Medical bodies have long argued that Australia’s health system remains too heavily skewed towards reactive hospital care rather than proactive prevention. Researchers believe that following this cohort through major life milestones—from university and early employment to parenthood and retirement—will provide the evidence needed to transition from crisis management to genuine preventive medicine.
