In 2025, the Guardian reported on research which reveals encouraging trends in dementia prevalence across generations. Australian researchers analysed data from 62,437 people aged 70+ across the US, England, and Europe, finding that younger generations show lower dementia rates at equivalent ages compared to their predecessors.

The study used analysis of cognitive tests and daily functioning assessments to identify likely dementia cases across eight generational cohorts. Results consistently showed age-related increases in dementia prevalence, but crucially, more recent birth cohorts demonstrated reduced risk at comparable ages.

Particularly striking examples emerged from the US data: among 81–85-year-olds, 25.1% of those born 1890-1913 had dementia, compared to just 15.5% of those born 1939-1943. Similar patterns appeared across Europe and England. Women showed more dramatic improvements, especially in Europe and England, potentially reflecting increased educational access during the mid-20th century. However, the World Health Organisation notes women remain disproportionately affected overall, representing a significant portion of the 57 million people worldwide living with dementia in 2021.

Experts attribute these positive trends to various interventions: compulsory education, smoking bans, and improved treatments for cardiovascular disease, diabetes, and hearing loss—all dementia risk factors. Despite this progress, the absolute number of dementia cases continues to rise due to ageing populations. Researchers emphasise that nearly half of dementia cases might be preventable through addressing 14 key risk factors, from lifestyle choices to environmental conditions. However, some experts caution that the steepest improvements may already be behind us, particularly given recent policy changes and potential plateauing of health advances.

References:

Younger generations less likely to have dementia, study suggests https://www.theguardian.com/so... (accessed 6.6.25)

ANSWER THE FOLLOWING QUESTIONS!

1. Calculate the percentage decrease in dementia prevalence between the 1890-1913 and 1939-1943 birth cohorts in the US (ages 81-85). Show your working.
2. Evaluate the cultural bias and population validity issues in this study.
3. The study used ‘analysis of cognitive tests and daily functioning assessments to identify likely dementia cases’ rather than diagnosis by a medical specialist. Why might this be a problem?
4. Discuss the potential economic implications of declining dementia rates across generations.

Challenge:

Researchers emphasise that nearly half of dementia cases might be preventable through addressing 14 key risk factors, from lifestyle choices to environmental conditions. Research what these factors are and use your knowledge of psychology to consider what intervention you could put in place to address one.