We all die. The stranger you hear about on TV, the person you brush past on the street, the people you meet, friends, family, parents, die. Death is inevitable and a day will come when we experience sadness like never before when a close friend or family dies, reminding us about our own limited lifespan.
Now instead of fearing, loathing, and hoping that day will not come, spend the lifetime of opportunities achieving greatness. That way when the end comes, all you will see is a speck of sadness in a universe of happiness.