Clearly, a job loss 23 years ago is not affecting your credit now.
You should view your credit report to see what is the cause of the poor score.
It possible you are a victim of ID theft and have not realized it.
Your options are to either offer a bigger deposit and get a stellar recommendation
From your current land lord along with a co signer who has good credit.
Clearly, turning in statements from the bank that you are financially sound will help.
But a job loss 23 years ago will be laughed at and maybe an outright cause for
Rejection. You are better of then saying you are looking into why your score is low
Then that 23 year reason.