A Clue To Dementia Could Show Up As Early As 45

Key Points:

• One in 11 people aged 65 and over in the UK have dementia, with risk roughly doubling every five years after age 70, according to the NHS and Alzheimer’s Society.
• A recent study suggests that elevated levels of the blood biomarker pTau181 in 45-year-olds may indicate a higher likelihood of developing dementia later in life, even before cognitive symptoms appear on tests.
• Individuals with higher pTau181 levels reported more concerns about their memory and thinking, a condition termed subjective cognitive decline (SCD), despite normal cognitive test results and no detectable brain changes.
• Researchers believe these findings highlight a potential early window for dementia prevention, although elevated pTau181 reflects risk rather than certainty of developing the disease.
• Further research is needed to confirm whether elevated pTau181 and SCD in midlife predict dementia, as current evidence is inconclusive and ongoing studies aim to clarify these early markers.