you imagine someone is threatening to kill you now
you know you would experience fear
you realize your eventual death in 30-50 years is going to be the same now feeling as it is now
you realize fearing death now is the same as fearing it in the future
you realize if you not fear future death that would be the same as not fearing now, so are you saying you wouldn't be scared sh*tless if someone tried t kill you now? or perhaps your imagiantion is failing, that would explain how you not see that future death is the same