So a local nerd pub (The Stormcrow) offered three word puzzles and said if we got all 3 correct we would get 10% off our bill, and entered to win a list of prizes. We think ourselves pretty good at these puzzles - so we gave it a whirl. Apparently we got 2 of 3 correct, but this is the one we got wrong.
The pub claims the answer (The Oldest Building) is the Lighthouse.
We claim it's incomplete, the oldest and youngest could either be the Lighthouse or the Library. But, if you add the assumption that "Brick is Red" then the answer is that the Lighthouse is the Youngest (not the oldest), and the Library is the oldest by process of color elimination. So either the puzzle is incomplete, or their answer is wrong.
Oldest Middlest Youngest 150 Years 100 Years 50 Years Colour? Brown Colour? Limestone Sandstone Brick Cathedral