The Enterprise encounters an Earth-like planet where a virus has killed all of the adults by causing them to age rapidly, while the aging process in children is slowed.
Air Date: 10/27/66
Director: Vincent McEveety
Annoying kids and the unexplained purpose for the planet looking exactly like Earth aside....you have a pretty fun episode. If you look carefully you will see they used the Mayberry set from The Andy Griffith Show in this one.