Technically the reason we have age of consent laws is because of how the body develops in humans. Its because people's bodies become more easily damaged when they're younger and they're psychologically still in early development and heavily rely on egocentrism and don't have long term thinking in terms of consequence.
If someone ages faster, just because they're technically three but have the psychological and physiological equivalent of an adult, then it should be fine....In theory, at least.