Probably 2018 or somthin

2021 in jan

There's no way the answer to this question is post-2016. If you look through the histories of articles and old talk pages you'll see that the largest amount of people making meaningful edits/contributions was around 2012 to 2016.

If by golden age you mean content creation and caring members, probably somewhere in the first 40% of the wiki's life.

If by golden age you mean cringy OCs, confused identity posturing, and poorly written erotic fanfics, then probably 2020-2021.

(Not that I'd really know, I'm pretty new)