[How do I verify that I'm an adult?]

Preferences are and have been set to adult but at the search adult is not marked.
So I went to what you showed and set it all to adult in those tabs.
But still when i go to the main search window it shows as it was. No adult.

Is there something else I can set to solve this, pls?

[How do I verify that I'm an adult?]

My Avatar can not enter all regions and buy freely what I like because after what I have been told it is not age verified. 
How do I verify that I'm an adult, please?