Joyce DeWitt
From 1977 to 1984, Joyce DeWitt starred as Janet Wood on the sitcom Three’s Company (a role she earned during the show’s second pilot).
In 1984, she actually retired from acting for some years before coming back in 1999. The 68 year old has some roles here and there.
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Jenilee Harrison
Speaking of Three’s Company, Jenilee Harrison, who played Cindy Snow, a replacement for Chrissy Snow (Suzanne Somers).
Harrison would go on to play Jamie Ewing Barnes in Dallas. At 59, she is still acting although her last acting role was in 2002.