Hmmm... You seem very familiar. Eh, that doesn't matter.
You are right about evolution being a theory, which is all it is. However, since evolution would constitute random times for particular changes, this couldn't possibly be scientific, since random moments for adaptations can not be predicted and "science is being able to predict somthing." So, are we on the same page here?
And about that last part... You mean that someone at age 19 and someone that is 13 will completely understand each other? Yes, they are both teenagers, and yes, they are both still in puberty and the mind is developing. However, you seem to not know about the separate stages of puberty. For generalization and time, let's simplify it down to only 3 stages: initialization 12-15 (Body structure and mental capacities start to enlarge - this prepares the body and mind for the next stage of puberty. Near the end of this stage, enhancements begin to take effect and the teenager can utilize new abilities mentally and physically); development 16-18 (Puberty advances to develop the advantages in mind and body - from the initialization stage - and expand on them. It is at this stage that reasoning is enhanced. Thought becomes more abstract, incorporating the principles of formal logic. Thinking becomes less tied to concrete reality.); finalization 18-20 (Awareness and "being" take shape in to a character - with this, maturity and cognivity rise. Final steps are taken towards becoming an adult.)
Now, that's just a generalization. Specifying everything would take too much time and effort, as I'm sure you can guess. I'll leave it up to you to figure out how someone could be too young to understand...
Thought becomes more abstract, incorporating the principles of formal logic. Thinking becomes less tied to concrete reality.
Just think about it