Who wrote what goes on 1 leg in the morning on 2 legs at noon and on 3 in the evening?

The first record of the Riddle of the Sphinx is attributed to Euripides, but probably comes from earlier Greek mythology. It asks, "What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?" The answer is, "A man, who crawls on all fours as a baby, walks on two legs as an adult, and walks with a cane in old age."