How young is too young to be diagnosed with mental illness?

My nephew, 5 and 1/2, is going through a lot of the same things I am, only more manic and violent at times. This next Thursday he will be moved to a long-term care facility which we hope will help more than the other things that have been tried.

Fighting for Phoenix can be found on FB at https://www.facebook.com/fightingforphoenix

More of his story can also be found on my sister's blog: http://www.caleighbabies.blogspot.com/2013/12/phoenix.html

They are looking for donations to help pay for the mounting medical bills:
http://www.gofundme.com/864q9g

No child should feel this way, should be going through this. The medical community has labeled an age on when someone can/will be "diagnosed" with all sorts of mental illness. Here is an example where this type of practice is wrong. "We" don't want to believe that such a young and vibrant child could feel the way he does, but he does and we must treat the cause not just the symptoms.

A video my sister put together: Fighting For Phoenix