Asklemmy

Extensive use of emojis and abbreviations is a good indicator.

All I'm learning from this thread is that no one can tell any consistent signs.

Excessive swearing, as if they just learned how to say “fuck”.

Not that any damn amount of fucking swearing means they are are a young fucker, but you can fucking tell when you read that shit and they manage nine goddamn swear words in one fucking sentence you know they’re a young bitch who aren’t allowed to swear any other damn time.

"skibidi" "rizz" "sus"

Using a year as an extremely long period of time, never uses "talk it out" as a solution to anything, mentions a YouTuber you've never heard of as if they're a global celebrity.

Also related to the first point, losing their mind over something that delays their education/life plans by 4 months or more.

My general metric:

Hahaha = gen x

Lol = older millenial

Lmao = younger millenial

💀 = Gen z

"im 9 btw"

Poor grammar/orthography

Crypto bros who follow ultra distorted stoicism (the only good philosophy is the ones made when slavery was normalised) that believe everyone else is unaware of what very basic knowledge they world they just learned that day.

ask if they remember these

Quick to call other people kids as an insult.

Writing in short form where a lengthier reply would work better and when confronted with such a reply some form of "not reading all that" or other thought terminating clichés.

I've found that as arbitrary as it is - the ability to read a lot of information works pretty well as a mark of mental maturity. Also links to Twitter or Tiktok as discussion points. No one over the age of 19 browses TikTok lol.

Unfaltering loyalty to the Chinese Communist Party

When they start calling people "jr" or implying anyone who disagrees with them is too young to understand.

Not sure if it's the case anymore, but strong opinions were matched with EQUALLY STRONG STYLISTIC CHOICE!!!!!!!, often coupled with poor grammar/spelling, and a tendency to lean more towards rehashing the same opinion rather than making a rational argument for it.

skibidi toilet

They’re the ones who are not obsessing over children’s toys or saying “adulting is difficult!”.

This one has been easy for me lately: They spell 'lose' as 'loose'.

"Arguing" by listing a long list of fallacies that they don't really even understand.

Fallacy fallacy!

Probably just internet slang and the skull emoji. That and poor grammar are (possible) indicators.