Aging and death are two things that still remain inevitable to humans. Everyone must grow old and everyone must die.
So what you should do is to plan for the future get prepared for what awaits you ahead. At some point the holy bible instructed that no matter what you do or whatever you are doing do it to the fullest because the end counts, nobody can escape these two things so I don't see any reason for anybody to be afraid of it rather pray for a good legacy.
Everyone must not grow old and that is why we still have untimely deaths on the course of death is inevitable that is why it is sorrowful when someone dies in a youthful ages and elders dieing in their old ages are being celebrated on farewells.
Definitely there is existence reputations for everyone even after life so, It is very important consider our awarenesses here on earth because it retains and image of legacies which you will be described as.