I won't know because to all intents and purposes, I'm single now.
My grandparents however. My granny died at 70, suddenly. They were a very 'together' couple. Worked together (even at that age they worked). Did everything together My poor grandad fell apart. His life was empty without her. He very quickly remarried an awful woman. He never complained and never said a word against her, but after 7 or 8 years, when most of his grieving for my granny was done, he said just once to me that he shouldn't have remarried. He was a good man though, unlike his son (my father) and stuck to his commitment until death.