Though since this is specifically about being an admin and not just an editor on Wikipedia, is this necessarily an issue? A lot of admin activity has become automated since those early days, so you don't need as many people to deal with vandalism or other forms of backlogs.

Heh, yeah, probably because the keyboard warriors running the site don't let anyone else help.

13 years isn't much

I don't put much value on the content on Wikipedia anyway. Most of it is written by only a tiny percentage of accounts, that have so many contributions that they may well be state/corporate actors. It has come up time and again that glowies of all colors edit Wiki pages.