While I feel I have not lived a very successful life for very many reasons, I don't fear death for one reason but I do pray for it to not be now, for a reason.
As a Christian, I do know this much, that every man is a soul covered by the flesh and while the soul never dies but transitions from this plane to a higher one, only the flesh rots. So I look forward to a higher 'calling', so to speak but not before my children are able to stand on their own two feet because they have become my life's purpose, they are the reason I don't want it to be now. Their successes would translate to my own success. Then and only then would I bow out without any regret.
I'm not sure about higher callings but I know this for sure, I have life now and want to live it the best I can and so I work towards that at the same time as planning the future. When I die...well, I'll not care too much afterwards I think.