Can Young People Get Dementia? Understanding Young-Onset Dementia

Understanding Young-Onset Dementia

 

"But they're only 45..."

It’s a sentence that healthcare professionals, families and even patients themselves often say when a dementia diagnosis is mentioned.

For many of us, dementia is pigeonholed as an "older person's condition." We picture someone in their 70s or 80s gradually experiencing memory loss. However, this assumption can become a clinical blind spot. Thousands of people across the UK are living with young-onset dementia (diagnosed before age 65), and for these individuals, the journey is often very different.

 

What Is Young-Onset Dementia?

Young-onset dementia refers to any dementia diagnosed before the age of 65.

According to the Alzheimer's Society, approximately 70,800 people in the UK are currently living with young-onset dementia. While less common than dementia diagnosed later in life, it is prevalent enough that healthcare professionals across a wide range of settings may encounter it during practice.

Around 1 in 20 people living with dementia are under the age of 65, challenging the common misconception that dementia only affects older adults. Most cases occur between the ages of 45 and 65, although rare cases have been reported in younger adults.

 

Why It's Often Missed

Because we are not usually looking for dementia in people in their 40s or 50s, early symptoms are frequently attributed to other causes. Common explanations include:

• Work-related stress or burnout
• Depression or anxiety
• Menopause
• Relationship difficulties
• Sleep problems
• General life pressures

In young-onset cases, particularly Frontotemporal Dementia (FTD)—the classic memory problems often associated with dementia may not be the first sign.

Instead, patients may present with:

• Personality changes
• Loss of empathy
• Impulsive behaviour
• Poor judgement
• Difficulty planning and organising
• Changes in language or communication

When these symptoms are dismissed as "just stress," diagnosis may be delayed, causing significant frustration and distress for both patients and their families.

 

How Is Young-Onset Dementia Diagnosed?

Diagnosing young-onset dementia can be challenging because symptoms often overlap with mental health conditions, neurological disorders and other medical problems.

Assessment may include:

• A detailed medical history
• A collateral history from family members or carers
• Cognitive assessments
• Blood tests to exclude reversible causes
• Brain imaging such as CT or MRI scans
• Referral to specialist memory or neurology services

Many patients spend months or sometimes years seeking answers before receiving a diagnosis.

As nurses, understanding this diagnostic journey can help us support patients and families during what can be an extremely uncertain and emotional time.

 

Future Nurse Thinking: Your Role at the Bedside

Imagine you are on placement. A patient's spouse quietly tells you:

"He's only 52, but he's not the man I've known for thirty years. He's struggling at work, forgetting important conversations and acting completely out of character."

As a student nurse, your radar should be up. While you should never jump straight to a diagnosis, your role is often to notice when something does not fit the expected picture.

Your Toolkit: The Collateral History

When cognitive decline is suspected, one of the most valuable assessment tools is the collateral history.

A patient may appear relatively well during a brief interaction. Family members, however, often notice subtle changes that have developed gradually over months or years.

If appropriate and with consent:

• Ask relatives about changes in daily functioning.
• Explore examples of personality or behavioural changes.
• Ask whether work, finances, hobbies or relationships have been affected.
• Document observations clearly and accurately.

This information can provide crucial context for the wider multidisciplinary team and help establish the patient's previous baseline level of functioning.

 

Future Nurse Thinking

A 54-year-old patient is admitted with recurrent falls and increasing confusion. During visiting hours, their partner quietly tells you: "He keeps forgetting how to use the washing machine and has become very withdrawn over the last year."

What would you do with this information?

Would you document it?

Would you discuss it with your mentor?

Could this collateral history influence the direction of the assessment?

Sometimes the most important clinical clues come from the people who know the patient best.

 

The Unique Impact of a Young Diagnosis

A diagnosis at 45 is not simply a medical event, it can be a life-changing crisis.

Many people with young-onset dementia are:

• Still working
• Raising children
• Paying mortgages
• Supporting ageing parents
• Managing significant financial responsibilities

Unlike many older adults with dementia, younger individuals may suddenly face concerns about employment, income, parenting responsibilities and future independence. Recognising this psychosocial impact helps nurses provide genuinely person-centred care rather than focusing solely on physical symptoms.

Did You Know?

In 2023, researchers published a case report describing a 19-year-old man with probable Alzheimer's disease, believed to be the youngest documented case reported in the medical literature.

The patient's symptoms reportedly began around the age of 17, with progressive memory difficulties affecting his studies and daily life. The case challenged many assumptions about when dementia can occur and highlighted the importance of remaining open-minded when assessing cognitive decline.

Cases like this are exceptionally rare, but they remind us that healthcare professionals should assess the whole clinical picture rather than relying solely on age-based assumptions.

Key Takeaways

Age alone should never rule out dementia, although young-onset dementia remains uncommon.

Around 1 in 20 people living with dementia are under the age of 65.

Look beyond memory loss. Behavioural, language and personality changes may be the earliest warning signs.

Use collateral history effectively. Family members often provide crucial information that patients may not recognise themselves.

Think holistically. Consider the significant emotional, social, family and financial impact of a diagnosis in younger adults.

Advocate for your patient. If the clinical picture does not match expectations, raise concerns with your mentor or the wider multidisciplinary team.

 

Over to You

Have you ever encountered a patient whose symptoms did not fit the "expected" age profile?

Or have you seen how a collateral history changed the direction of an assessment?

Share your thoughts and experiences in the comments below.

 

Disclaimer: This article is intended for educational purposes and student nurse learning. It should not replace local policies, specialist advice, or national clinical guidance.

 

References

Alzheimer's Research UK. (2025). Young-Onset Dementia. Available at: https://www.alzheimersresearchuk.org

Alzheimer's Society. (2025). Young-Onset Dementia. Available at: https://www.alzheimers.org.uk

Dementia UK. (2025). What is Young-Onset Dementia? Available at: https://www.dementiauk.org

NHS. (2025). Dementia Overview. Available at: https://www.nhs.uk/conditions/dementia/

Jia, J., Zhao, T., Liu, Z., Liang, Y., Wang, G. and Jia, J. (2023). A 19-Year-Old Adolescent with Probable Alzheimer's Disease. Journal of Alzheimer's Disease, 91(4), pp.1435–1442.

Loi, S.M., Radford, K., Velakoulis, D. and Walterfang, M. (2023). Young-Onset Dementia: Diagnosis, Management and Care. Internal Medicine Journal, 53(3), pp.353–362.