Apologies for being off topic, but this is rare and I would love to hear from anyone dealing with this in a boy under 9 (or thereabouts). If you would like to maintain some semblance of anonymity (I understand!) please feel free to PM me.
Basically DS 8, has some signs and is under the care of an Endocrinologist. They talk very much about medical (chemical) changes but I am keen to learn about others' experiences and about any emotional changes observed, impact on behaviour, learning, and school life and whether you chose to medicate or not.
Obviously, this is far more common in girls.