The guy is a dumbass.
Lots of 21 year olds have Top Secret clearance. Hell, my son had it when he was 19. I'll never forget the FBI banging on the door at 7 AM saying 'We need to talk to you about your son' when they did his background check.
The argument that young people should not have clearance is stupid.
Did the clearance system fail, should they me monitored better yes. But when it comes to cyberwarfare you want young talented people doing it.
He even owned himself in the video. After ranting that young people should not have this clearance he rants that old people don't understand technology. Well which is it, only old people can handle the responsibility of the tech, or they don't understand tech.
And why are old people less likely to be criminals than young people?
He also clearly does not understand what 'Top Secret Clearance' means. It does not mean he can see everything. He can only see what is related to his job. It is not the free for all that the moron in this video thinks it is.