To make a Will in England and Wales you must be 18 years or over. There are only two categories that are legally allowed to make a Will under the age of 18 – soldiers on active duty or sailors at sea. There is no upper limit to making a Will but you must be of ‘sound mind’. The legal term is ‘sound testamentary capacity’, which means you understand the extent of your estate and that you are giving your assets to particular beneficiaries. You may feel that when you are making your Will, your mental capacity may be questioned. If you feel this may be the case a medical practitioner may be asked to confirm that you have capacity.