Star Trek: The Next Generation

Rascals - S6-E7

Corrected entry: A transporter accident transforms Picard, Ro Laren, Guinan and Keiko O'Brien into small children who appear to be about 12 years old. Picard is 30-40 years older than Ro and Keiko. Guinan is over 500 years old. Why are they all returned to the same age?

Grumpy Scot

Correction: Simple - their bodies have all been 'reset', as it were, to the same stage in their lives - apparently just before the onset of puberty. Therefore, they all appear to be the same age.