בס''ד
Aging is caused by clogging of the arteries and other natural processes in the human body. If we could invent a way to prevent any clogging of the arteries, people theoretically could live hundreds of years. However, we are far away from such a discovery.
We know from numerous scientific studies that a healthy diet, exercise and a relaxed mind reduce clogging of the arteries and therefore slow the aging process. We can't stop the aging process. We are all aging and we will all die. But we can slow it down dramatically and we can live longer.
Of course, the Messianic era will usher in a new world where there will be resurrection of the dead and where the nightmare of death will end. People will live here in this world forever. That day will come when we decide to follow what G-d commands us to do.
Thank you for opening this thread. I always want to encourage our great members to eat healthy, exercise and try to relax their minds. This will not solve all of your problems, but in the long term it may solve many of them.