You might check out this article if you havent seen it already.
Starting Strength: Article
I have/had my own struggles with early intermmediate programmg so I am not an expert. But you might want to swap out your heavy set of 5 for 1 or two sets of 3s. Going from 5s to 3s is a pretty big pyschological and physical relief and you can keep adding weight to the bar and handle increasingly heavier weights.
I am 45 and I have been thinking about programming as we age (looking forward to Baker and Sullivan's book!) but the conundrum for us, I think, is that as our training advances we need more volume but as we age our ability to tolerate volume decreases.
So my thinking now is that we need to try to keep intensity pretty high while we find a way to apply a dose of voluem we can recover from.