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I've heard that more generally (not restricted to young people) but something about it doesn't hang together. If they're not concerned about covid then why would they be concerned about the vaccine? There must be something more to it on a psychological level than them not wanting an "untested" vaccine. Also, I tend to hear it from people hoovering up marching powder or inhaling processed meat, the irony of which appears to be totally lost on them.
The primary reasoning I've heard from vaccine-refusing young people is along the lines of "covid doesn't really impact us and the vaccine is unproven/untested so why would I take that risk?"