Shopify
Shopify is an ecommerce solution allowing makers to build an independent stand-alone website without the need to create things like a checkout system from the ground up.
Installing an Age Gate with Shopify
Go to Online Store->Themes->Actions->Edit Code
Expand Snippets->Add a new snippet->Name the new snippet "age-check" and hit done.
Copy and past all of the code from HERE into the new snippet and save.
Expand layout->Theme.Liquid-> search for the first use of <Body> and post in -
{% render 'age-check' %}
The example below shows <Body> with the inclusion of a class so the entire line is <body class="gradient">. Don't worry this is the same thing. Just don't grab anything that doesn't start with "<Body" and definitely not "</Body>"
Hit save and view your site. First time visits will now receive an age gate notice like the below.
Future Topics:
Pros / Cons
Predictable Pitfalls