Yes since Power Rangers has lasted 20 years since it premiered in 1993 and it is now 2013 so that's an even 20 years. However it lasting another 20 years is an uncertainty but definitely doable as long as Haim Saban and Saban Capital Group still want to keep on making Power Rangers and as long as Japan's Toei continues to create additional Super Sentai series.
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Power Rangers Zeo was created on 1996-04-20.
sadly rangers with 14 and Celtic with 7 in 2nd
Power Rangers Dino Thunder ended on 2004-11-20.
Power Rangers Mystic Force was created on 2006-02-20.
Power Rangers Zeo - 1996 Found and Lost 1-20 was released on: USA: 20 May 1996
Power Rangers Zeo - 1996 was released on: USA: 20 April 1996
"Mighty Morphin Power Rangers" began in 1993, and the power rangers series has continued to the present day under various names.
Power Rangers Megaforce - 2013 Legendary Battle 2-20 is rated/received certificates of: USA:TV-Y7
Power Rangers Zeo - 1996 Found and Lost 1-20 is rated/received certificates of: USA:TV-Y7
Power Rangers Turbo - 1997 Stitch Witchery 1-20 was released on: USA: 12 September 1997
Power Rangers Samurai - 2011 Samurai Forever 2-20 is rated/received certificates of: USA:TV-Y7