I realise this about as useful as asking "how long is a piece of string?" but bear with and I will attempt to set parameters.
OK, so there has been an apocaplyse and now, at the time of my question, a century later, mankind has been reduced to a strictly ground-based existence. Many of the old timers have remembered the stories they heard growing up about how mankind used to have planes and spaceships etc, but frankly a lot of the younger folk either don't care or just flat out disbelieve. There is still old tech everywhere, some broken, some working and commonly used.
(INSERT EDIT HERE) Before the apocalypse the society had approximately 5 trillion inhabitants. Most on-world, some off-world. So, a lot more satellites than 'our' Earth currently has in 2020, plus there were also many O'Neill Cylinders, an Orbital Ring, many hundreds of space elevator towers leading to the Orbital Ring, and a fledgling Dyson Swarm growing near the Sun. Most of the stuff in low Earth orbit started colliding when humans stopped controlling it. A little at first, but then it quickly grew until it became full on Kessler Syndrome. Most of the stuff in high Earth orbit is untouched. (2nd EDIT here) Quick note to mention that my space elevators are not based on hard science, that this is very much a sci-fi-fantasy story, that there is magic based tech involved, and the towers do not have the usual 'tether-ball' arrangement that hard science demands. They are literally only towers 100kms high. About half of them attach to the Orbital ring, but the rest are just launch/ land platforms + accomodation. Also, I fully expect Kessler Syndrome to last more than a century, and my story reflects this. Although I have not got the expertise to back this up, (hence the question), my story requires it so I am very glad if we can prove that KS will actually still be happening a century after this mysterious apocolypse.
The question I want to know is, would the Kessler Syndrome still be in place and happening a century later, or would it have burned itself out by now?
I realise I am short on details, so huge apologies on that regard, but nevertheless wondering if anyone has any ideas?