Dexter's Laboratory
Dexter, a boy-genius with a secret laboratory, constantly battles his sister Dee Dee, who always gains access despite his best efforts to keep her out, as well as his arch-rival and neighbor, Mandark.

Season 1 · Episode 9 ·
Old Man Dexter
Banned from watching a late-night movie due to his young age, Dexter uses his technology to artificially grow into adulthood, but Dee Dee tampers with his machine, causing Dexter to turn into an old man.
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Episode 9 of season 1 of Dexter's Laboratory: “Old Man Dexter”. Aired 1996-05-12. Watch it online free on ZapFlix.