Originally Posted by avatar7
Yeah, I remember that, but it doesn't specifically mean he made him younger, just stronger. Perhaps you're right though.
Edo Tensei revives a Ninja in their prime. It just so happens that Ninja rarely die of old age, and usually die in Battle, and mostly when they are in their prime. If the 3rd Hokage hadn't sealed himself away in the death god, and had been revived by Kabuto, he would have definitely come back much younger than he was.
The only one that doesn't fit is Nagato, but I think that was mostly plot point.