A will, testament, or codicil is not valid for any purpose unless the person making it is at least 18 years of age and, at the time of executing or acknowledging it as provided by this chapter, of sound and disposing mind and capable of executing a valid deed or contract.
D.C. Code § 18-102
Capacity to make a will
Sept. 14, 1965, 79 Stat. 686, Pub
Official source: D.C. Law Library (Council of the District of Columbia). Reproduced from public-domain District of Columbia statutes; confirm against the official source for the current text. Not legal advice.