Augustin was buried in the cemetery of Eardley. The ceremony took place on

November 27th, 1872 at Aylmer, parish St-Paul.  No mention about his age.

Rose Théotise Séguin was buried on July 19th 1886 at Luskville, parrish St-Dominique.  She was 85 years and 5 months.

There's no parents names on his marriage act.  That's a sign that Augustin was probably an illegitimate child.  I found an Augustin, son of Augustin and Marguerite Millaire, born on August 18th 1893, baptized the 19th at Montreal.  But he married Julie Larivière on the 26th of september 1814 in Montreal.

Yves.