Memory loss in your 40s and 50s: what's normal and when to worry

Walking into a room and forgetting why. Losing your train of thought in a meeting. Forgetting an appointment you’d written down. In your 40s and 50s these moments can feel alarming, especially if someone in your family has had dementia.

Most people forget things from time to time, and in midlife there are many common, often treatable reasons for it.

Common causes in midlife

• Stress and overload: work, children, ageing parents and money worries all compete for attention
• Poor sleep: including sleep disturbed by night sweats, snoring or worry
• Anxiety and depression, both of which affect concentration and memory
• Perimenopause and menopause: forgetfulness, losing words and poor concentration are common, and for many women improve once symptoms ease and sleep gets better
• Medicines and alcohol
• Health conditions such as thyroid problems, low vitamin B12, diabetes and high blood pressure

What is usually normal

Forgetting a name or an appointment now and then, misplacing your keys and then retracing your steps, or taking a little longer to recall things are common and don’t usually point to dementia.

When to see your GP

The National Health Service (NHS) advises seeing a GP if you keep having memory problems, especially if they affect your day-to-day life. It’s often nothing serious, and treatment tends to work better when started early. Signs that need checking include:

• Memory or thinking that is noticeably worse over several months
• Forgetting recent conversations or repeating yourself
• Struggling with tasks you used to find easy, at work or at home
• Changes in personality, behaviour or language that others notice

Dementia that starts before 65 is called young-onset dementia. It is much less common than other causes of memory problems, and early signs are more likely to involve language, vision or behaviour than memory.

What can help

• Protect your sleep and get treatment for anything that disturbs it
• Find ways to manage stress that work for you
• Stay active: regular exercise supports brain health
• Write things down and use reminders while you find the cause
• Ask your GP to check blood pressure, blood sugar, thyroid and vitamin levels

Midlife is also when the risk factors for later cognitive decline start to matter most. If you want to understand your own brain health in more detail, our Brain Health Programme and Cognoscopy are good places to start.