We all live different lives. Some grow rich; some remain poor. Some live a long life; some die young. Some have good health; some suffer from physical ailments. Some get to live an easy life; some have to struggle hard to make a living. I can go on ad infinitum. But to understand, you need to have the overall picture, including where each person ends up after death. And only God knows all that. If you knew too, you'd see that God treats everyone fairly with perfect justice.