Board Thread:General Discussion/@comment-86.46.22.35-20130403153709/@comment-86.164.186.167-20130611220226

No Zero wanted the perfect clone of Big Boss so he was aged much faster. Only Solid (and maybe Liquid) had the normal aging process until adulthood. Remember Solidus was also sent to Liberia in the late 80's where of course he would kill Raiden's parents and have him join his unit. So it would be that he was aged as a child rather than as an Adult. Then theres the fact that he would later become the President  in 2001 at the age of 30 something.