2 things you can be sure about:
1.) It will happen.
2.) No way to predict when.
How then shall we live?
CS Lewis:What is important is not that we should always fear (or hope) about the End but that we should always remember, always take it into account. An analogy may here help. A man of seventy need not be always feeling (much less talking) about his approaching death: but a wise man of seventy should always take it into account. He would be foolish to embark on schemes which presuppose twenty more years of life: be would be criminally foolish not to make—indeed, not to have made long since—his will. Now, what death is to each man, the Second Coming is to the whole human race. We all believe, I suppose, that a man should “sit loose” to his own individual life, should remember how short, precarious, temporary, and provisional a thing it is; should never give all his heart to anything which will end when his life ends. What modern Christians find it harder to remember is that the whole life of humanity in this world is also precarious, temporary, provisional.