This case of a 15 year old hacker disproves your argument.
With all of the information available on the internet, and with the level of automation and software tools available, it is certainly possible for someone who is motivated to learn enough to hack systems in just a few years. When I started, there was no internet and information was accessible primarily through manuals printed by IBM. There was no Google, no hacker communities, no forums, no social media, no personal computer.... none of today's tools that accelerate learning and collaboration. Even programming has dramatically changed, no longer requiring machine language or the ability to
read hexadecimal or binary.
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Whether you believe it or not, today's youth have access to vast amounts of information and software tools, as well as to those who would offer mentoring and support. A teenager can certainly acquire advanced knowledge and skills in a very short period of time, given today's environment.