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There have been several threads and theories already about this topic, and that's exactly what Nomura intended with the whole issue.DDD Ultimania said:Q: What happened to Terra's heart and body?
A: In this game, Master Xehanort does not appear in the form of Terra-Xehanort when he transferred his heart, but as the old man he was before he took control of Terra's body. During the revival, what happened to Terra's body, and Terra's heart that was in opposition to Xehanort's control? In Kingdom Hearts, Birth by Sleep, it is to be considered that it was thought the whereabouts of the heart of Terra's master, Eraqus rested within his body.
That's still a mystery that hopefully will be explained in KH3. In one of his interviews, Nomura only gave us a little brain-tease; he posed the question himself, "What happened to Terra's body and heart?"
Theories abound, ranging from that Xehanort somehow came back as his old self due to uncommon circumstances (Xemnas being Terra's body and the Robed Figure and Ansem SoD being his own heart) to that he discarded Terra's body some time after his resurrection and somehow regained his elderly form. That said, it's all up in the air for guesses.