Like, I’m probably answering myself here but I think it is pointed out by gatekeepers who can’t stand the idea of community growth and everything should adhere to some other unfound arbitrary way to keep things ‘pure’ in a community.
When they forget that they too, started out as new and that they too probably have had other people sneer at them for simply being new. So now they go around and pretend this is some kind of ultimate shut-down insult to people who’re just trying to contribute to the fediverse by devaluing it by saying “OH U JUST SOME DAY OLD ACCOUNT, NOBODY SHOULD MIND THEM!”.
I use Voyager to access Lemmy, which is heavily based on Apollo for Reddit. And one of the very best things they kept in Voyager is the “New Account Highlightenator”, which adds a baby emoji next to a username, with how many days the account has been active. This disappears after a month (I think it is), but it’s really, really handy for quickly highlighting whether it’s worth paying attention to the shitty opinions being spouted.
Chances are, if it’s a bot or a troll, they’ll be using a new account. If I see shitty opinion + baby emoji, I’ll block and move on.
Other than that, I personally don’t really give a shit how long someone’s been on here. This is my third account on a third server since I first discovered Lemmy a couple of years ago, and I’ve only had this one for a couple of months.