Sister, Sister (1994)

S5E17 Young at Heart

Title: Forever Young Plot: The twins hatch a plan to infiltrate a dance club that has a strict age limit of 21, all to catch a live performance by hip-hop sensation W.C. (playing himself). At the same time, Lisa decides to slip out of the house for a romantic evening with Aaron, who has just crossed into the world of adulthood at 21.