Blockland is for loving adults.
It's doing a good job of that then with the majority of it's players being under the age of 20.
Really, most adults wouldn't be seen playing a sandbox Lego game. It's quite obviously aimed towards a younger audience, and it just so happens that catches people from the age of 18 and below (not to say that there aren't players older than 18).
The game has plenty of things that would interest younger people and children. Lego-style bricks, Large multiplayer (both off and online), sandbox abilities, modability, etc...
I don't know of many children that wouldn't be interested in a game like this. (Let Roblox be an example of this. It has a large playerbase of children, who are obviously interested in the concept of "SandboxMultiplayerLego" games, which Blockland also falls under).
