I keep saying this, but no one seems to believe me so it might well just be my perceptions!
I started school in 1985, so I did start in the glory days (apparently) when there was no national curriculum.
Teaching was TERRIBLE! We learned nothing about SPAG, Maths was ‘work through a textbook’, teachers were sarcastic and cutting, bullying was rife. I’m sure there were many decent ones, but safeguarding wasn’t a thing and some of the things the teachers said and did in primary school were awful.
I started secondary in 1992, and bullying was still a huge issue, as was behaviour. We had SATs in Year 9 and a lot of our GCSEs had a heavy coursework weighting, so there was a lot of cheating.
I then started teaching myself in 2003. Behaviour was dire and I joined the TES forums where teachers kept commenting how much better behaviour had been ten/twenty years ago. My subject had coursework - cheating went on.
Then controlled assessments came in in 2010/11 (I think!) endless stress getting them in and up to standard and marking the things.
Now … very content heavy curriculum. Behaviour still an issue. Endless systems relating to technology - show my homework, Frog, ClassCharts. I wish we just used one.
I don’t think there’s ever been a golden age. I think every age has had problems, some unique to that time but some like poor behaviour has just always been an issue.