There are multiple studies on this. I can’t link them in the chat. The age range varies but gyno happens with both young males(I’m talking pretty young) not someone in their mid 20s+. And in elderly men.
I def don’t think that is normal. It might happened but it is not normal. You should expect it and look out for it to mitigate it in case it does
The dose is not the issue though. It’s the body’s response to whatever dose and the increase in IGF.
For example, I could take 4 ui and my igf wouldn’t increase as much as you taking the same dose.