Pink Floyd made it clear.
The sun is the same in a relative way but you're older, shorter of breath and one day, closer to death.
What are we doing here?
Admire existence and what your body allows you to experience as existence and everything else will become simpler.
I am so far from being the right person to explain this as would all wisest teachers.
I owe everything to them and to what they have been able to give me.
Here is a little bit of giving it forward.
One life, one death, no repeat, no pause of this one.
Why spend time on nothing else but admiration of life and existence. May all our actions celebrate this.