It is rare for someone in their late 60s, 70s, or 80s to develop psychosis for the first time without a history of mental illness — but it does happen. When it does, the official name is very-late-onset schizophrenia-like psychosis (VLOSLP), a term coined in a 2000 international consensus statement led by the AAGP and reflected in clinical practice ever since.
VLOSLP is first-episode psychosis after age 60, with prominent persecutory and partition delusions, often in people with sensory impairment or social isolation, and requires careful workup to exclude dementia and medical causes.
The naming convention
The international consensus on late-onset schizophrenia recommended:
- Schizophrenia — onset before age 40
- Late-onset schizophrenia — onset between 40 and 60
- Very-late-onset schizophrenia-like psychosis — onset after age 60
The careful word "schizophrenia-like" reflects ongoing debate about whether very-late-onset psychosis is a true variant of schizophrenia or a partly separate condition driven by neurodegenerative or sensory factors. The DSM-5-TR does not give it its own code — clinicians typically diagnose schizophrenia or "other specified schizophrenia spectrum disorder" with a notation about late onset.
Typical presentation
VLOSLP often features:
- Vivid persecutory delusions, often involving neighbours, intruders, or specific named individuals
- Partition delusions — the belief that people, gases, smells, or radiation pass through walls, ceilings, or floors
- Multimodal hallucinations — auditory, visual, tactile, or olfactory, sometimes all at once
- Relatively preserved insight in some cases, with the person knowing the experiences are unusual but unable to dismiss them
- Low rates of formal thought disorder compared with early-onset schizophrenia
- Less prominent negative symptoms
Who develops it?
Risk factors that come up repeatedly in the research literature include:
- Female sex
- Sensory impairment, especially hearing loss
- Living alone
- Lifelong schizoid or paranoid personality traits
- Limited social contact
- Recent bereavement or relocation
The differential is everything
First-episode psychosis at this age is rare enough that the first job of any clinician is to make sure something else isn't being missed. The differential includes:
- Delirium — the single most important consideration, often triggered by infection, medication, dehydration, or hospitalization
- Dementia with psychotic features — Lewy body dementia and Alzheimer's both can present this way
- Mood disorder with psychotic features
- Charles Bonnet syndrome — visual hallucinations from severe vision loss, with intact insight
- Brain tumour, stroke, subdural haematoma
- Medication-induced psychosis — anticholinergics, dopamine agonists for Parkinson's, steroids, opioids
- Substance use disorders, including alcohol
- Endocrine and metabolic disturbance — thyroid, B12, sodium
A workup typically includes a full physical exam, basic metabolic and complete blood panels, thyroid function, B12, urine tox, urinalysis, and brain imaging (MRI preferred over CT when possible). A cognitive screen — most commonly the MoCA — is essential.
Treatment
Antipsychotic doses for VLOSLP are usually much lower than typical adult doses — sometimes a quarter of the dose used in early-onset cases. The American Geriatrics Society Beers Criteria calls for caution with antipsychotics in older adults broadly, with particular concern when used for behavioural symptoms of dementia. Schizophrenia and schizophrenia-like psychosis are recognised as appropriate indications.
Important non-medication elements:
- Treat hearing loss
- Treat vision loss
- Increase social contact
- Address loneliness as a clinical issue
- Coordinate with primary care, geriatrics, and family
An older adult develops sudden new beliefs of being watched, intrusion, or persecution — particularly if accompanied by confusion, fever, fall, or rapid functional change. These can signal delirium, which is a medical emergency.
Prognosis
Outcomes vary. Many patients respond well to low-dose antipsychotic treatment combined with sensory and social interventions. Others develop progressive cognitive change suggesting an underlying neurodegenerative process, which becomes clearer over months. Long-term follow-up — typically annual or biannual — is the standard of care.
This article is for educational purposes only and is not medical advice, diagnosis, or treatment. Always consult a qualified mental health professional. If you or someone you know is in crisis, call or text 988 in the US, or your local emergency number.