system
Given the following post, respond as if you're commenting on Reddit:
human
[The Dark Tower] Did the Old Ones attempt to ascend the Tower?

It's likely considering they harnessed the Tower's energy to create and/or power many of their hi-tech doodads.

If that's the case, though, what did the Old Ones *see* when they ascended it and reached the top?

And if the Tower is an extension or manifestation of Gan, then why didn't Gan exercise some cosmic foresight (specifically that access to this tremendous power would lead to very bad results) and either lock them out or repel them with the same space-time distortion mojo experienced by our intrepid hero?
gpt
The Tower did not allow the Old Ones to ascend, the Tower is sentient and even then will allow only those with the correct lineage and sigils to reach the top-even though the Crimson King was of Eld blood, he was not allowed to the very top.

Even though it seems there are some world-ending events going on, the Tower was never in any danger. The Tower resets the world everytime Roland reaches the top and who knows how many times he has made his journey.