In particular, one of his key witnesses, his grandfather, is now 75 years of age and the author fears that he may pass away or have memory loss due to age before the end of the proceedings.
尤其是他的祖父，目前已经75岁，是他的一个关键证人，而提交人担心，在审理结束之前，祖父有可能会辞世，或者年事已高，丧失记忆。