Indeed, Allah's promise will be fulfilled. The Death is something so inevitable, yet so very often forgotten. Each day that passes, each day we breathe, each day we go about our lives, sinning or doing good, is but a day closer to our end, closer to our return to our Creator - Allah the All- Mighty. Many of us, have at some point in our lives, lost a close relative or a close friend. True, we shed tears, we show remorse and we show sadness - but I ask you  what did you learn? How did you reflect it upon your ownself?
you think that death is yet a distance from you and you will not taste it until at a later age, or perhaps when you think that you are better prepared for it's coming ... and indeed this way of thinking arises only from falsehood!
Allah Almighty says, “Every self will taste death. You will be paid your wages in full on the Day of Rising. Anyone who is distanced from the Fire and admitted to the Garden, has triumphed. The life of this world is only the enjoyment of delusion,” (3:185)
The Prophet (SAW)said ;Remember much that which destroys the pleasures : Death. Since no one remembers it at times of difficulty except that things are made easy for him , nor mentions it at times of ease except that the affairs become constricted on him.[Saheeh Jaami Sagheer : 1222]
From Saalim ibn Abdullaah from Abu Hurayrah: When Umar ibn al-Khattab used to give sermons to the people , he used to say ; The most succesful of you is the one who preserves from desires,and greed, and anger. After truthfulness ; there is no more good in any other kind of speech.And whoever tells lies, becomes immoral.And whoever becomes immoral, is destroyed. So beware of immorality ; and how is the immorality of a slave created from dust, and to dust he shall return, and today he is alive ; tomorrow he is dead? JUMMMAH MUBARAK