We often assume:
Words carry their everyday meanings.
Numbers behave the way we usually think they do.
Conventions are universal.
None of these are guaranteed in puzzles.
2. Language Is Fragile
The way a question is phrased determines what counts as a “trick.” Here, the ambiguity lies in the meaning of “year.”
In one sense, a year is a label:
1980, 1981, 1982, …
In another sense it’s a duration:
365 days long (or 366 in a leap year).
The riddle plays on the first meaning rather than the second.
3. Context Matters
If the puzzle were rewritten to include dates, most people would immediately see the answer.
For example:
“Someone was born on March 15, 22 BC and died on December 21, 1 BC. How old were they?”
Here, the birth and death dates make the logic explicit.
But when the riddle uses year labels, our mental shortcuts kick in.
Other Interesting Calendar Quirks
