bobrun, didn't I suggest for the OP to contact CX directly as the best solution? We seem to be on the same page here.
There aren't any regulations on this per say, but CX is not the only airline with this policy:
Can I become an airline pilot when I am only 163 cm tall?
Then again, my whole point was to play the devil's advocate and letting the OP know that this is a rumor's forum - something like this that could impact the OP's future career is
best solved by contacting CX directly (something that we both advocate).