It may be the nostalgia talking, but there is no way that this is the 'golden age' of the Premier League
Yes maybe the bottom half teams are better than any other league, but the top half teams are repeatedly getting humiliated in Europe. Even the Europa League tends to be won by Spanish or Italian teams.
But the thing that matters IMO is the top teams. IMHO the golden era of the PL was the mid to late 2000s.
Arsenal: mid 2000s Arsenal was arguably the best side in club history. In Europe they did not achieve that much, but at least they made it to a final. Even late 2000s Arsenal with Fabregas and RVP was a formidable side, repeatedly making the CL QFs. I would say mid 2000s>>modern dary>late 2000s
Chelsea: No question here
Manchester United: again, no comparison, late 2000s ManU is among the greatest teams ever
Liverpool: Modern day Liverpool had no doubt a great run, but even mid to late 2000s Liverpool was a quite good team, winning 1 CL and making the Final and Semis one more time. They even had 1-2 season when they were contenders in the PL. The gap is not that huge.
Manchester City: The only team that is clearly better nowadays.
But when you look at the bigger picture, back then the english teams routinely made the semis, sometimes even multiple teams reached the semis the same time. Nowadays only Manchester City is a real CL contender.
2021 Chelsea was an anomaly, they are the ONLY CL winner the last 20 years or so that were irrelevant BOTH before and after the winning season.