Thank you for the suggestion, you may have spared me from one of the biggest regrets of my life.
However, I find it hard to say the words, it doesn't really need to be said, it is known. It's a cultural difference for me.
In return, all I can offer is the notion that you are not alone. This is something that probably all of us have to face one day.
Also, I recall the story of Richard Feynman in his old age walking with his friend joking about his surgery & illness, and his friend remarked that he is sad because Feynman was probably going to die soon.
Then Feynman said that he has told so many stories over his lifetime, and it feels like he's won't really be completely gone as long as those stories are remembered.
The 42 song by Coldplay encapsulates this.
"Those who are dead are not dead, they're just living in my head"