yes they are not stupids if they really kno what death is, its no joke n a certainty which has to come no matter what, so keep urself ready fot it then wait for death so that u kno ur free of anything which might act as a barrier in ur repentance & make u suffer in the hereafter!
life once gone will not return so true with time also but u can change ur time as in u kno be a better person than what u are today whereas after death u cannot change ur life , the deeds u have done while being alive n all healthy n capable of doin whatever u want.
yes i donot have a pleasant encounter with it cause i kno i dont have enough deeds in stock to help me out for repentance, so i surely need more time so that i can change someday n be a person who will gladly embrace death n die peacefully, whose sure of a happy life after death which is eternal!