youth n. \ˈyüth\ : the time when a young person has not yet become an adult.
Brett Kimberlin’s first felony conviction was for perjury when he was 19 years old. That might be stretched to qualify as during his youth, although a 19 year old is legally an adult. It’s not a series of crimes.
He was convicted of a series of crimes beginning in 1979 with his drug smuggling conviction. He was 25 years old, old enough to serve in the House of Representative, and clearly not a youth.
Brett Kimberlin is one of the clumsiest liars I have ever dealt with. He makes Joe Isuzu seem to be a pillar of probity.