You can use Shopify Markets and the Shopify Translate & Adapt App to translate age verification into other languages.
First, go to Settings => Languages from your Shopify admin and check that the language you want to translate to is added.
Next, go to Settings => Markets and find the market for the language you want to translate
Next, click on “Manage” for your market and go to “Domains and languages” and check that the language your want to translate is added.
Now go to the “Translate & Adapt” and select the language you want to translate to
Next, click on “Store metadata” and find the text you want to translate. Only add translations for the exact text that you want to translate.
Next, if you click “View store” you should see the translated text!