A Shopware 6 plugin which checks the age of the visitor. For the first visit a modal opens and asks it the visitor is at leat 18 years old. If the visitor claims to be 18 or older a cookie is stored for 30 days and the model is closed.
Copy the AgeModal folder in your custom/plugins folder of Shopware.
In Administration go to Settings > System > Plugins and install and activate the Plugin.