What is the impact of cognitive decline on the validity of a will?

For a will to be deemed valid, the person making it, known as the testator, must possess the necessary mental capacity to sign the will. This is determined through a three-step examination. Firstly, the testator must comprehend who their beneficiaries are, meaning they must be aware of their family members. Secondly, the testator must understand the nature and value of their assets, meaning they must be aware of what they own. Lastly, the testator must grasp the practical consequences of the will. If an individual is experiencing senility, it is possible that they may not comprehend one or more of these factors, raising doubts about their mental capacity to sign the will.