It’s the Friday Puzzle!

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If you are visiting the Edinburgh Festival over the weekend, I shall be presenting the last three performances of my new interactive psychology-based show Experimental. Details here, and there is a little video about the show below…

So here is this weeks puzzle.

The day before yesterday Edward was 17.  Next year he will be 20.  How can that be the case?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.