Here is just some of it:
What I expect will most probably happen is that my body will fail, my mind will cease to function, and that will be that. My genes will not live on, because I have had no children. Perhaps I have been infertile. If I discover that somewhere along the way I conceived a child, let that child step forward and he or she will behold a happy man. Through my wife, I have had stepchildren and grandchildren, and I love them unconditionally, which is the only kind of love worth bothering with.
I am comforted by Richard Dawkins' theory of memes. Those are mental units: thoughts, ideas, gestures, notions, songs, beliefs, rhymes, ideals, teachings, sayings, phrases, clichés, that move from mind to mind as genes move from body to body. After a lifetime of writing, teaching, broadcasting and happily torturing people with my jokes, I will leave behind more memes than many. They will all eventually die as well, but so it goes.