It could be said that the Universe being weird beyond human imagination is a good thing.

When there is a margin beyond what can be imagined, that stretches so far away that the distant ships sink beneath the horizon, the margin is functionally infinite to human perspective.

That allows for an endless source of wonder and mystique regarding the Universe, to the point that no matter how many years one lives, it will never be completed, or become boring.

This is one reason to not grow beyond the human form, because in that growth, one may find the finite state of the Universe, and become bored.

This includes a proposed state of infinite cellular regeneration, i.e. Agelessness. 

With that state, one's Age may as well be an Infinity Symbol, but that doesn't mean one can collect all the knowledge that can be gained.

One's Brain will be replaced by a new one every 50 years in the slow process of Cellular Regeneration, and old memories will eventually become so unstable that they will be gone.

One can make new memories, and one can make various types of recordings, but one still has a finite window of memory and experience in one's mind.

Perhaps one may remember for 100 years at a time, more or less, but the cache is erased at some point to make room for new memories.

This is where Active Externalism comes into play.

In this state of Agelessless, one has a Home that is part of one's Body and Mind. One's Personal Library becomes a Testament to one's Personally Gained Knowledge beyond what one's Brain may contain.

So, the Library only gets larger with Time.

It may start with a room, until additional rooms need to be added, and eventually a literal Library Building will be required. First one, then two, and then a Town of Library Buildings, and then a City, and then a Metropolitan City.

At a certain point, the amount of Land will become a problem, and one must expand their ever-growing home into Space.

This includes the housing and facilitation of one's infinitely growing family, and these people also contribute to the Library.

There is space for this. If one lived for Trillions of Years, there would still be no end to the Available Space in this regard.

Get cozy, and open your Sketchbook to Page 1.