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Since both are time travellers, that depends. When Amy & Melody (River Song) met in "The Time of Angels", Melody was older than Amy. When Amy gave birth to Melody (shortly before "A Good Man Goes to War") Amy was older than Melody. At some points in "The Impossible Astronaut"/"Day of the Moon", Amy was -- simultaneously -- with one incarnation of Melody who was older & another incarnation who was younger.