He gets up later in the morning than he used to. He eats only because his wife prompts him. He no longer reads the newspaper. “It is not worth it,” he says when asked why he no longer goes to the card-playing evening. His wife thinks he has simply grown old.

In reality he has a moderate depression. And it has nothing to do with age — it has to do with an illness that in older people often looks different from how it looks in younger ones and that for precisely this reason so frequently remains untreated.

As a geriatrician I see depression almost every day — often as an incidental finding in an assessment for a fall, weight loss or declining performance. And I see what changes when it is recognized and treated. The father from the introduction returns to the card-playing evening after three months of antidepressant therapy. Depression is not old age. It is one of the most treatable illnesses in old age.

Brief overview:

Depression in old age is one of the most common and at the same time most underestimated conditions in geriatric medicine. Around 15 to 20 percent of people over 65 develop relevant depressive symptoms, and in nursing homes as many as one in three. Depression in old age is not an understandable reaction to growing older but a serious, treatable illness — with mortality rates comparable to those of some oncological diagnoses. In men over 75 the suicide rate is higher than in any other age group, and one third of suicides are attributable to untreated depression. The insidious thing: in older people depression often does not present as classic sadness but as loss of drive, physical complaints, sleep disturbances, loss of appetite or cognitive deterioration. These symptoms are frequently dismissed as “age-related”. This article explains what depression in old age really looks like, why it is often confused with dementia and what really helps — from psychotherapy and medication to physical activity.

How common is depression in old age?

Seniors living at home: 15 to 20 percent have relevant depressive symptoms.
After a hospital stay: 25 to 30 percent of older patients develop depression in the months afterward.
Nursing homes: Up to 40 percent of residents.
After heart attack, stroke, cancer diagnosis: 30 to 50 percent develop a clinically relevant depression in the first year.
Suicide rate: Men over 75 have the highest suicide rate of all age groups in Germany — one third of which is attributable to untreated depression.

Despite these figures, depression in old age is massively underdiagnosed and undertreated. Estimates assume that only one in three of those affected receives adequate treatment.

Why depression in old age is often overlooked

Three systematic reasons explain the gap in care:

1. Depression looks different in old age

Typical symptoms in younger adulthood — pronounced sadness, tearfulness, feelings of guilt — come to the fore less often in old age. Instead the following dominate:

Loss of drive and interest
Social withdrawal
Physical complaints without a clear organic explanation (pain, dizziness, digestive problems)
Sleep disorders, especially early waking
Loss of appetite and unintended weight loss
Concentration and memory disorders
Irritability instead of classic sadness
Hopelessness that manifests as “weariness of life”

2. Depression is interpreted as normal aging

“He has simply grown old.” “She has been through a lot.” “That is no wonder at her age.” These sentences are humanly understandable — and medically dangerous. They prevent the diagnostic question. Yet the specialty of Geriatrics and Medicine for the Elderly counts depression among the most common and most consequential illnesses in later life.

3. Depression is confused with dementia

Cognitive deficits in depression can be so pronounced that they clinically resemble dementia. This is referred to as pseudo-dementia. Conversely, incipient dementia can produce depressive symptoms. The distinction is clinically demanding, but decisive.

→ For the detailed differential diagnosis: Dementia or depression? — the most common misdiagnosis in old age.

Causes and triggers

Depression in old age is multifactorial. The most important drivers:

Physical illnesses: Heart failure, COPD, diabetes, chronic pain, cancers — all markedly increase the risk of depression. Depression is not only a consequence but often also an amplifier of these illnesses.
Neurobiological changes: Serotonin, noradrenaline and dopamine systems change with age. Chronic inflammation plays a growing role.
Medications as triggers: Certain antihypertensives, benzodiazepines with long-term use, corticosteroids and some Parkinson’s medications can trigger or intensify depressive symptoms.
Losses: Death of a partner, loss of friends, children moving out, moving into a nursing home, loss of physical independence — all of this favours the frailty syndrome and depressive developments.
Social isolation: Loneliness is a distinct biological risk factor — measurable in the blood, not only psychologically relevant.
Vitamin D deficiency: Common in older people, it contributes to depressive symptoms. It is also associated with osteoporosis in old age.
Sleep disorders and pain: Chronic consequences that pave the way for or intensify depression.

→ On the role of medications in psychological side effects: Polypharmacy in old age.

Diagnosis: What a proper work-up includes

The diagnosis is clinical — that is, it is made through a structured conversation. The Geriatric Depression Scale (GDS), a questionnaire with 15 yes/no questions developed specifically for older people, provides support. A score of 6 points or more indicates a relevant depression.

The work-up additionally includes:

Cognitive testing (MMSE, MoCA) to distinguish from dementia
Laboratory: TSH (hypothyroidism), vitamin B12, vitamin D, electrolytes, kidney function, inflammatory markers
Medication review — which preparations could be involved?
Assessment of social factors (loneliness, living situation, recent losses) — a comprehensive frailty screening can provide valuable clues here
Suicidal thoughts — ask openly, do not avoid

Openly addressing suicidality in old age is not a provocation — it is a standard of care. Studies show: raising the subject does not increase the risk but opens the path to help. Many older people are waiting for someone to ask.

Treatment: What really helps

Modern depression therapy rests on three pillars, which are ideally combined.

1. Psychotherapy

Effective in older people too — studies show that cognitive behavioral therapy (CBT) and interpersonal psychotherapy (IPT) are comparably effective for depression in old age as at a younger age. The common assumption that psychotherapy is “no longer worthwhile in old age” has been disproven. Accompanying psychiatric-psychotherapeutic specialist treatment may also be indicated.

2. Drug therapy

SSRIs (e.g. sertraline, citalopram, escitalopram): The most widely used antidepressants in old age — effective, relatively well tolerated. Caution with interactions (risk of bleeding in combination with anticoagulants) and sodium balance (SIADH).
SNRIs (venlafaxine, duloxetine): Additional noradrenergic component, often helpful with additional pain.
Mirtazapine: Often used in older people because of its sleep-promoting and appetite-stimulating effect. Good in weight loss and malnutrition as well as sleep disorders.
Agomelatine: For sleep disorders, few interactions.
To be avoided in old age: Tricyclic antidepressants such as amitriptyline and doxepin — strongly anticholinergic, on the PRISCUS list. Increased risk of delirium, falls, cognitive deterioration.

Drug therapy requires patience: the first effects often appear only after two to four weeks, the full effect after six to eight weeks. The early conclusion that it “does not work” after one week is often premature. In older patients with several illnesses, a check for interactions in the context of polypharmacy is also advisable.

3. Non-drug interventions

Physical activity: The evidence is strong — aerobic training shows effects comparable to those of mild to moderate drug therapy. Physical activation is also a central component of geriatric early rehabilitation.
Social activation: Group activities, day care, voluntary companionship — the direct counterweight to loneliness as a cause and an effective measure against immobility in old age.
Light therapy: Particularly effective with a seasonal pattern.
Vitamin D substitution: For proven deficiency, not as a blanket measure.
Treatment of accompanying sleep disorders: Sleep hygiene, where appropriate agomelatine or low-dose mirtazapine.

When standard therapy is not enough

For treatment-refractory or severe depression, further options are available:

Augmentation: Combining an antidepressant with a low-dose neuroleptic or lithium.
Electroconvulsive therapy (ECT): Highly effective for severe, drug-resistant depression or depression associated with suicidality. In old age it is often better tolerated than many medications. The publicly held prejudices against ECT do not reflect the current state of the evidence.
Transcranial magnetic stimulation (TMS): A non-invasive procedure with increasing evidence for depression.
Inpatient psychiatric treatment: For suicidality, inability to care for oneself or severe psychotic depression. In such situations the question of an advance directive should also be discussed early.

What relatives can do

Take it seriously: Do not play it down, do not respond with “chin up”. Depression is an illness, not an attitude.
Accompany: Go along to the doctor’s appointment, support with treatment planning. The path often does not succeed alone.
Encourage activity without pressuring: Joint walks, small tasks, regular contact. Targeted fall prevention in everyday life also protects against the dangerous consequences of listlessness.
Always take expressions of suicide seriously: “I don’t want to go on” is not a throwaway remark. React — medical or emergency medical help.
Relieve your own burden: Relatives caring for depressed patients are themselves at increased risk of depression. Self-help groups and professional support are not a weakness — palliative care support can also relieve relatives when the illness is far advanced.

When should you see a doctor?

The earlier, the better. Specifically:

Persistent dejection or listlessness for more than two weeks
Social withdrawal and giving up previously valued activities
Persistent sleep disorders, loss of appetite, unintended weight loss
Physical complaints without a clear organic explanation
New or increased cognitive impairments — possibly a sign of mild cognitive impairment (MCI)
Statements such as “It is not worth it any more” or “I don’t want to go on”
Acute suicidal thoughts — then not appointment scheduling, but urgency

The first point of contact is the general practitioner. In multimorbid older patients the geriatric perspective is often particularly valuable — it connects the depression with the overall situation. A structured geriatric assessment helps to capture all relevant factors systematically. For complex psychiatric courses, the specialist in Psychiatry and Psychotherapy is the right address.

→ How a comprehensive geriatric assessment links depression with other problems: Geriatric assessment.

References

Kok RM, Reynolds CF (2017): Management of Depression in Older Adults: A Review. JAMA. DOI: 10.1001/jama.2017.5706
S3 Guideline on Unipolar Depression, DGPPN and DEGAM, AWMF Register 051-028, current version.
Schuch FB, Vancampfort D, Richards J et al. (2016): Exercise as a treatment for depression: A meta-analysis adjusting for publication bias. Journal of Psychiatric Research.
Alexopoulos GS (2019): Mechanisms and treatment of late-life depression. Translational Psychiatry. DOI: 10.1038/s41398-019-0514-6

Depression in Old Age — Recognize, Treat, Return to Life