Actual sale/transaction happened on Nov 19th, 1869 but British government didn’t accept the transfer of the land until July 15th, 1970. Hence July 1st is celebrated as “Canada Day”.
Citizenship grants: Applicants 55 years of age or older – Applications received before June 11, 2015
While applicants 55 years of age or older are waived from meeting the knowledge of Canada and language requirements, they must still be scheduled to appear for an interview as they must meet other requirements under subsection 5(1) of the Citizenship Act.