Grammatically yes, but to me the whole sentence seems oddly worded and over-complicated. It seems to be leaving open the possibility that such a thing is possible or feasible, but just not yet conclusively proven. Also, "on earth" seems superfluous, and "man" unncessarily specific.
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Grammatically yes, but to me the whole sentence seems oddly worded and over-complicated. It seems to be leaving open the possibility that such a thing is possible or feasible, but just not yet conclusively proven. Also, "on earth" seems superfluous, and "man" unncessarily specific. How about just this:
No one can live forever or stay young forever.