Old people can't write, and they can make a will by writing books or recording videos. A will that entrusts others to write on behalf of others shall be witnessed by two or more witnesses, and one of them shall write on behalf of others, which shall be signed by the testator, agent and other witnesses, and marked with the year, month and day. The following persons cannot be witnesses to the will: (1) persons without civil capacity, persons with limited civil capacity and other persons without witness capacity; (2) Heirs and legatees; (3) People who have an interest in the heirs and legatees.

Legal objectivity:

Article 135 of the Civil Code: A will written on behalf of others shall be witnessed by more than two witnesses, one of whom entrusts others to write on behalf of others, and shall be signed by the testator, agent and other witnesses, and marked with the year, month and day. Article 140 The following persons shall not be witnesses to the will: (1) persons without civil capacity, persons with limited civil capacity and other persons without witness capacity; (2) Heirs and legatees; (3) People who have an interest in the heirs and legatees.