First, you must be 16 years of age or older to make a Will in BC. Second, you must have sufficient mental capacity to make a Will (see here https://onyxlaw.ca/estates-and-trusts-law/vancouver-estate-litigation-lawyer/undue-influence-and-lack-of-capacity/ for more on the issue of testamentary capacity).
Third, there are formal validity requirements. Your Will must be in writing and signed by you in the presence of two witnesses, who. must be over the age of majority and also sign the Will. There are