Dylan (who is almost 19) attended a Seder in Boston with my brother's family, and since my nieces are 4 and 2 he wound up reading the 4 questions as the youngest literate person at the table.
I'm still usually the one who does the four questions at my family seder -- none of the cousins who have kids live close enough to come to the seder, so I'm the youngest at 45. I'm also the one leading the seder, which makes the whole thing not really make any sense.