Shakespeare got it wrong when he said 'Men have died and worms have eaten them, but not for love' (As you like it).
My mother told me that when her mother died, her father, who was in normal health, stood at the graveside and said 'I'll soon be with you, Kate'. He was dead in three days. I have known similar stories amongst other elderly couples.
I am a great believer in the effect that our emotions have on our physical well being. We know that some people with incurable illnesses sometimes just give up and 'turn their face to the wall'.