Donald is listed as 86 years on his tomb stone.  A picture of the stone is on file.

1901 census for ON WELLINGTON (South/Sud) (#126) Erin b-5  Page 10
McGill Donald M   Head M Feb  7 1868 33
McGill Maud E. F   Wife M Jul 7 1877 24
McGill Jennie D. F   Daughter S Nov 14 1896 5
McGill John E. M   Son S Apr 12 1898 3