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.
The holy scriptures have been saying that death and aging are inevitable. However, if someone does not live a haphazard life but lives within a certain control, then he can definitely live a long life due to his well-controlled life. It's not that he will become immortal if he lives long, but rather that death will eventually consume him. There is no time limit on when death will happen to anyone because a healthy person can die at any time. Or a sick person can die at any time. Death is an eternal systematic process that will come in the life of any person.