Who was the youngest actor to play the lead in his own TV series?

Jay North of “Dennis the Menace” (CBS, 1959-63) and Jon Provost of “Lassie” (CBS, 1957-64), tied at age seven were the youngest actors to play the lead in his own TV series.

“Lassie” actually ran from 1954-71, but Provost was not on all those years.

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