For being the longest-running game show host.

http://www.nydailynews.com/entertainment/tv/alex-trebek-breaks-guinness-world-record-jeopardy-host-article-1.1830693

Who held the previous record? And he looks great for 73.

I'm guessing Bob Barker.

What about Pat Sajak? Seems like he's been on as long as Trebek.

Wikipedia says Trebek has hosted Jeopardy! continuously since 1984.  It's less clear on Sajak's run.  He started in 1981, but it says there have been other hosts since then, and it does not say when he returned.

vkimo wrote :

What about Pat Sajak? Seems like he's been on as long as Trebek.
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I heard Trebek say he is trying to host Jeopardy as long as possible so Sajak won't beat his record lol

Ray Combs would still be hosting Family Feud, had it not been for Jonathan Goodson and all of those problems in his life.