The Big Bang could be a Steem cell that experienced unbelievable expansion. Pockets of mass where galaxies form have function in that area of the organism we reside in.
Subatomic structures and structures in the Universe not only have similar structure, they are the same structures seen on different scales of size.
We are a subatomic structure in our solar system at high gravity so time is very slow to us.
16 billion years since the big bang might be 16 months to the organism we reside in.
Depending on the life form our Universe resides in we might expand for eons. Or suddenly collapse with the death of our host.
Dark matter and dark energy are food being consumed and used by the life form to continue to grow and move about its environment that might look like our own.
Its dark because we are inside. Otherwise we might not exist in the low density of outside our lifeform.
No intelligent life has been discovered because we are at the highest evolved beings. Other intelligent life in our Universe is on the same level as us. We are never meant to escape our own Universe although we might explore it with time.
There are multi-Universe and we can communicate with higher intelligence through portals in our minds. Never physical contact.
Note: Earth is 4 billion years old. The Universe is 16 billion years old.
So maybe it takes 4 billion years for a solar system to develop intelligent life.
Then theoritically we are 4th generation. The highest intelligence allowable by this model in the Universe would be 1st generation.
If they could survive the many obstacles of life around a star and black holes to stay alive, then this civilization would have technology 12 billion years beyond our own.