Either no effect for kids or it potentially damages their skin's ability to produce collagen consistently
More long term research needed
Initial google searches say that there's no negative effects on preteens although theres no reason for them to use it
I call bullshit on the first part
Skin care industry is worth billions of $ so they will absolutely game SEO to get more kids addicted early
Just like how maybe 40 yrs ago cigarette companies pushed the rhetoric that smoking isnt bad for you for years until they lost in court over it