Golden Age was more the age of the newspaper. From when Yuyu created the Morning /bant/er to when Aya published the last efition of the /bant/ Bunmaru, /bant/'s last regular paper. The current age is more or less the result of the newfag influx that came from both the April Fool's joke and the enormous wave of imptrash that innundated /bant/ April through May. A ton of regular users also stopped coming after a schizo mod started randomly deleting threads because he hated /bant/ natives resistance to accepting /pol/trash, threads like draw threads, /comfy/ threads, anime threads, flag threads, etc. Also, coincidentally around the same time, April was the month frogposters from /r9k/ decided to wage some gay several-month long civil war with the entire board, killing Apu in the process. All this shit going on left gaypost threads and their cancerous ERP near-untouched resulting in the rise of the gayposting cult mostly focused around namefags. On top of that there were little stupid spats between other posters, notably Alicefags and that one Raffiefag and the like, leaving the board overall disunited and without any real guiding force when all major agitators and dramafags had left.
You'll also notice the board's stark dropoff in post-rate after the Autumn semester began.
If ya wanna Silver-Age, just remeber how to have fun and don't be the cynical teenbro that defines both this current age and the rest of the site as a whole.