Dementia does not automatically prevent a senior from signing a will in Singapore. What matters is whether the person still has the mental capacity at the time of signing. Under Singapore law, a will is valid if the person understands what they are doing and meets certain legal criteria.

1. The Senior Must Understand What a Will Is

Even with early or moderate dementia, a person may still understand that:

• A will distributes their property after death
• They are choosing who receives what
• The document takes effect only after they pass away

If they have this level of understanding at the moment of signing, they may still be legally capable.

2. They Must Know the Extent of Their Assets

The senior must still have a basic comprehension of what they own, such as:

• Their property (HDB, condo, shophouse, etc.)
• Bank accounts and savings
• Insurance payouts
• Investments or businesses

They do not need perfect accuracy — only reasonable awareness of their estate.

3. They Must Recognise Their Beneficiaries

The senior must understand who their likely beneficiaries are, for example:

• Children
• Spouse
• Siblings
• Close caretakers or friends

They must be able to express who they want to include or exclude, and why.

4. They Must Not Be Under Undue Influence

A will made under pressure, manipulation or coercion is invalid. Common red flags include:

• Someone speaking on behalf of the senior
• Family disputes surrounding caregiving or inheritance
• Sudden, major changes to the will favouring one person
• Signing the will in a rushed or secretive environment

The senior must be making the decision voluntarily, of their own free will.

How Lawyers Verify Capacity

For dementia cases, lawyers typically require:

• A medical report confirming lucidity at the time of signing
• A private interview with the senior
• Witnesses who can attest to mental clarity
• Clear records or audio/video documentation

This protects the integrity of the will and reduces future legal challenges.

Bottom Line

Dementia does not automatically invalidate a will. If the senior still has lucid moments and meets the four conditions above, a legally valid will can still be made.