Date: Thu, 14 Apr 2005 15:30:02 -0500 (CDT)
From: <samlubell at verizon.net>
Subject: [WSFA] Longest running TV
To: WSFA members <WSFAlist at WSFA.org>
Reply-To: WSFA members <WSFAlist at WSFA.org>

>From: "Mike B." <omni at omniphile.com>
>Date: Thu Apr 14 15:11:02 CDT 2005
>To: WSFA members <WSFAlist at WSFA.org>
>Subject: [WSFA] Re: New Dr. Who
>>I assume you're limiting yourself to SF series.
>
>There are other kinds?
>
>>Because otherwise I believe Gunsmoke is the record
>>with 20 seasons.

Does the Disney anthology show count?  It began life as Disneyland in 1954, became Wonderful World of Color in 1961, Wonderful World of Disney in 1969 and ran through 1983. It was off the air for a couple of years, then 1986-1990, then 1997 to present.  So that gives it about 40 years under various titles and channels.

http://www.answers.com/topic/walt-disney-anthology-series.