A will is generally considered valid if it meets the following criteria: (1) The testator (person making the will) must be of legal age, usually 18 or older; (2) They must have testamentary capacity, meaning they understand the nature of making a will and its effects, as well as the extent of their property; (3) The will must be executed with testamentary intent, indicating that they intend the document to serve as their last will and testament; (4) It should be in writing, although some jurisdictions recognize oral or nuncupative wills under specific circumstances; and (5) It must be signed by the testator and witnessed according to state laws, typically by two disinterested witnesses.