Marian Smith, 74, was found dead at a property on Aberdare Close in Blackburn, Lancashire at 09:10 BST on 9 April.
Lancashire Police said a post-mortem examination established that she had died from stab wounds.
John Smith, from Aberdare Close, is due to appear before Preston Magistrates' Court later.
An 87-year-old man has been charged with murdering his wife, police have said.