The median age of a youth extremists is 19 [1], with the mean being ~20 (study rounded up).

The main issue with this bill is that it requires a huge cost in civic freedoms, with questionable benefits to societal stability. Not only do most youth extremists first offend past the threshold this age verification would catch, this legislation lets big tech off the hook for designing addictive algorithms in the first place, since "there are no kids on the platform anymore, and if there are, they're breaking the law".

[1]: https://www.tandfonline.com/doi/full/10.1080/1057610X.2025.2...