Canada and Australia are jumping in [2] [3].
[0]: https://ec.europa.eu/commission/presscorner/detail/en/ip_25_...
[1]: https://www.twobirds.com/en/insights/2024/france/la-loi-sren...
[2]:https://facia.ai/news/canada-proposes-age-checks-for-online-...
[3]: https://www.abc.net.au/news/2025-07-11/age-verification-sear...
The UK law is basically a "go figure it out", which inevitably leads to making shady deals with third parties that are now handling the data of citizens... privacy and data leakage issues abound.
The EU meanwhile is working on a whitelabel application that can confirm nothing other than "this user is above 18" (which they can do because the EU has national ID for basically anyone living in it. It also works for another set of age ranges, as the idea is to also use this to confirm stuff like buying alcohol) and is designed to be easy to implement for anyone without having to get approval from the EU first. (Technical specification is available here[0]). It's not perfect (last I saw, they're apparently tying it to Google Play Services for device verification), but it's a far better attempt than the UK/Australia are doing.