I'd suggest under 25.
I agree, I've always said (once I realised what was going on) that everything from Botox to boob jobs to this butchery should be age restricted for under 25s.
I would put in more assessments for the over 25s too.
It is the worst kind of medical abuse as it is celebrated, it's some kind of toxic cocktail of gaslighting, mutilation and lack of accountability.
Any regret expressed, if this young girl managed this somehow in later life, will be met with "it's what you wanted".