Do you mean it in the sense that people would remember who you are and what you did? But they die too. What aspect of the past you think will keep on existing? I just want to understand your point
At the risk of being perceived as :
In a world where you can move in any direction for 3 dimensions but only 1 direction for the 4th dimension it may seem as a given that time is a constant.
However it's well documented that, both in perceived and measured time, conditions arise, based on our mental state (unconsciousness, routine, boredom) or the speed at which we move relative to one another (atomic clocks tick slower in orbit than planetside), that alter the speed at which time flows.
Time as such is clearly not a constant and can be slowed down or sped up based on various circumstances.
While it seems we are all determined to move towards the future our senses are limited to experiencing only the present. Tomorrow and the days after we will still be in the present and today will definitively be relegated to the past.
Or will it?
As our actions today influence the course of events tomorrow so have our actions of the past given shape to our present. All are inextricably linked together. This dependency on one another necessitates the need for the past to exist as a reality that would inevitably lead to our current present.
A reality where it's June 22nd 2021 and you just registered to the SS forums; a present where you are taking your first babysteps; a present where ...
You are still doing all of those things until the end of time. I believe they call this
existential dread.
An interesting article with a similar idea can be found here:
Does the past still exist somewhere?