In the UK the public overwhelmingly support the age controls, so even political parties who would otherwise oppose it just stay silent, because the public narrative
You have to shift the narrative. Farage does this - he's finally after 20 years managed to get elected to parliament, he's head of a company with 4 MPs, same say as the Greens, about the same as the nationalists, yet for 20 years he has steered the conversation and got what he wants time after time
This couldn't be further from the truth.
People usually support the idea if asked on the street in passing, but don't support the implementation at all.
Can we do that ethically? No. Of course not. The implementation must necessarily require death and theft.
Age verification is a similar problem. I support the idea of minors not accessing bad data. Okay, cool.
Is there an ethical way to implement that? No, of course not. It would require extreme surveillance and said surveillance would necessarily be used for evil.
I mean, imagine this. New law: children can never smoke law. Great! 100% support! Now you must upload a video of you smoking every time you smoke so the government knows a child isn't smoking. Uh... Not great, very bad.
Its all about how you ask the question: "do you support children never smoking" => 100% support. "Do you support requiring video uploads to the government of every time you smoke" => 0% support.
We're actually asking the same question, it's just a matter of how favorably we show the issue.