Causes of age-related memory decline and what helps

Why memory can change as we get older

Many people notice some changes in memory as they move through later middle age and beyond. These changes range from occasional lapses (misplacing keys, forgetting names) to more significant difficulties that interfere with daily life. Understanding the common causes helps you recognise what’s normal and what should prompt medical advice. For product-specific guidance, check our For product-specific guidance, check our RhythmONE review.

Common biological causes

Ageing brings a number of subtle brain changes. Neuronal processing speed can slow, and structures important for memory such as the hippocampus may shrink a little over many years. Blood flow to the brain can also decline if cardiovascular health is poor, which affects cognitive function.

Vascular and health-related causes

Conditions that affect the heart and blood vessels — high blood pressure, diabetes, high cholesterol and small vessel disease in the brain — can all contribute to difficulties with memory and thinking. These are sometimes called vascular cognitive changes.

Medications and substances

Several commonly prescribed medicines can affect concentration and memory (for example some sedatives and strong antihistamines). Excessive alcohol use, recreational drugs, and even sudden stopping of certain drugs can also impair memory.

Mood, sleep and other reversible factors

Depression and anxiety are frequently linked with memory complaints; people often describe difficulties concentrating rather than true memory loss. Poor sleep — whether from insomnia, sleep apnoea or disrupted sleep patterns — markedly reduces the brain’s ability to consolidate memories.

Nutritional and endocrine causes

Deficiencies in certain vitamins (particularly vitamin B12) and thyroid problems can present primarily with memory and concentration issues. These are usually reversible if identified and treated.

When memory change is a sign of something more serious

Not all memory change is the normal ageing process. You should see your GP if memory or thinking problems:

• are getting noticeably worse or interfere with daily activities
• affect work, finances, or personal safety
• are accompanied by changes in mood, behaviour or movement
• begin suddenly or after a fall/illness

Your GP can do a basic assessment, review medicines, check blood tests (eg blood sugar, B12, thyroid), look for mood or sleep problems and, if needed, refer for further memory assessment.

Evidence-informed things that may help

No single intervention guarantees preserved memory, but several well‑supported approaches are associated with better cognitive health in later life:

1. Look after cardiovascular health

Controlling blood pressure, cholesterol and diabetes is one of the most reliable ways to reduce the risk of vascular-related memory decline. Quitting smoking and keeping a healthy weight also help.

2. Keep physically active

Regular aerobic exercise (brisk walking, cycling, swimming) supports blood flow and may help preserve memory and thinking. Strength training and balance exercises are beneficial for overall health and independence.

3. Sleep and mood

Treating sleep disorders and addressing anxiety or depression can improve concentration and memory. Good sleep hygiene—regular bedtimes, limiting screens before bed and reducing caffeine—supports memory consolidation.

4. Mental and social activity

Engaging in mentally stimulating activities (learning new skills, puzzles, reading) and staying socially active are linked with better cognitive reserve and resilience.

5. Diet

A heart-healthy diet such as the Mediterranean diet—rich in vegetables, fruit, fish, legumes, wholegrains and healthy fats—has been associated with better cognitive outcomes compared with diets high in processed foods.

6. Review medicines and alcohol use

Ask your GP or pharmacist to review all prescription and over‑the‑counter medicines for possible effects on memory. Reducing heavy alcohol intake can also help cognitive function.

7. Check reversible causes

Simple blood tests can detect vitamin B12 deficiency or thyroid problems. Treating these conditions can often improve memory complaints.

Supplements and ‘memory’ products — what to know

Many supplements are marketed to support memory and brain health. For example, RhythmONE is marketed as “designed to help support memory function and may contribute to brain health” and is said to contain a blend of plant-based ingredients such as schisandra, gotu kola, shilajit, lion’s mane mushroom, bacopa monnieri and others. Makers often claim proprietary formulas and natural sourcing.

However, marketing claims are not the same as proven clinical benefit. Evidence for supplements varies widely in quality and quantity. If you’re considering a supplement:

• Talk to your GP or pharmacist first—particularly if you take other medicines or have medical conditions.
• Check for independent quality marks and be cautious about bold guarantees.
• Remember that lifestyle changes (exercise, diet, sleep, treating medical issues) have the strongest evidence for helping cognition at a population level.

Practical next steps

If you’re worried about memory: make a note of specific changes, bring a list of medications to your GP, ask about basic blood tests and consider a structured memory assessment if recommended. Early identification of reversible causes and managing vascular risk are sensible priorities.

For more on specific products and independent analysis, see our RhythmONE review linked above.

This page is for information only and does not replace professional medical advice.

Related reading

• RhythmONE review: full verdict
• How nootropics and herbal extracts support brain function
• How to choose a safe herbal memory supplement: a buyer’s checklist