Any age verification process that does not consider the age of the account as a verification option is a data trap, plain and simple.
How does anyone know whether a family is engaging in that time-honored tradition of passing down accounts from grandfather, to father, to son, to child, and their posterity, in perpetuity?
Seriously though, unless you have positively identified the person who created the account in the first place, you have 0% chance of knowing whether it is the same person using it today.
Gamers sell their high-level accounts all the time. It would be a simple matter of economics that the Discord users with the oldest accounts sell them to 12-year-olds. Likewise, accounts are shared willy-nilly, whether or not that violates the rules. And accounts can be stolen or compromised, if you're really hard up.
Yeah, my youtube/google account is almost as old as youtube itself is, but will constantly ask me to verify my age when clicking on something as marked 'not for kids'. Can we just get the leisure-suit-larry age-verification system ;)
Apple deleted many legacy mac-dot-com accounts without qualms, not long ago. It was the phone accounts, in so many ways, driving it .. IMHO
They are planning on doing something similar:
Discord is also rolling out an age inference model that analyzes metadata like the types of games a user plays, their activity on Discord, and behavioral signals like signs of working hours or the amount of time they spend on Discord.
“If we have a high confidence that they are an adult, they will not have to go through the other age verification flows,”