Henry Ernest Dudeney/Puzzles and Curious Problems/41 - Ancient Problem

by : $41$

 * Ancient Problem
 * ''Here is an example of the sort of "Breakfast-time Problem" propounded by in  $310$.


 * Demochares has lived one-fourth of his life as a boy;
 * one-fifth as a youth;
 * one-third as a man;
 * and has spent thirteen years in his dotage.
 * How old is this gentleman?