http://www.legislation.gov.uk/apni/1939/12/section/4Evidence Act (Northern Ireland) 1939An Act to amend the law of evidence.texttext/xmlenStatute Law Database2011-05-262006-01-01
Presumptions as to documents twenty years old.4In any proceedings, whether civil or criminal, there shall, in the case of a document proved, or purporting, to be not less than twenty years old, be made any presumption which immediately before the commencement of this Act would have been made in the case of a document of like character proved, or purporting, to be not less than thirty years old.