That's something I've been wondering since the day I understood what death was. You first have to understand what death is. Only you can define death for yourself, so I'll leave that part to you. But why do we die? Well, technichly, we doe because our bodies have problems or our cells are not able to reproduce. But, it's up to you to define the reason WHY you die. I think that the day I know what I was put on this earth for, I could die after that day. I think I have to discover myself before I die. But, it might be different for you. You can only decide this on your own, so only YOU have the answer for yourself.