I thought he competed in the olympics when he was in high school / college. A lot of people compete in the olympics in high school. Specially in gymnastics. I had someone in my class do it. The age limit is 15.
Does it matter for the argument though? Who cares how young he was when he started using it.
Check this out.... Look at his traps. Look at his opponent. All these guys are on it man.
Nobody who isnt on it has traps like this. There arent enough androgenic receptors on traps and shoulders to develop like this without steroids.
Take a look at this:
http://nattyornot.com/example-traps-transform-steroids/
If you want scientifc evidence, here is a pubmed study (from the article i just linked) :
https://www.ncbi.nlm.nih.gov/pubmed/10664066
Or google "androgen receptors traps steroids" or any variation of stuff like this and you will see.
Not to mention cormiers suspecious T/E ratios over the years.