what was the show in the early 80s where a 25ish and a teen went back in time to correct history?

It was indeed the Voyagers. That was a great series. Just didn't last long enough.

Here is a write-up on it:

Airs Next: NBC at Sunday 7:00 PM (60 min.)

Status: Ended Premiered: October 3, 1982 Last Aired: July 31, 1983

Show Categories: Action/Adventure, Science-Fiction

Introduction:

"We travel through time to help history along. Give it a push when it's needed. When the Omni's Red it means history's wrong. Our job is to get everything back on track. Green light kid, We did it!"

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Phineas Bogg is a member of a group people called Voyagers. They help history along. Give it a push where it's needed. He is a regular human that was living as a pirate a few hundred years ago, when he was chosen to be a voyager. He travels by way of a gold pocket watch like device called an omni. When the light is flashing red, it means history is wrong. His job is to fix it. In the pilot episode, Bogg ends up in 1982 when his omni malfunctions. (He is only supposed to be able to go as far as 1970.) He ends up in the apartment where 12 year old Jeffery Jones and his aunt and uncle live. (Jones parents were recently killed in an accident.) While there, Jeffery's dog grabs hold of Bogg's guide book (basically a history book.) Bogg being a pretty inept history person has no clue what to do without his book. One thing leads to another and Jeffery falls out of the building's window. The only way to save him is for Bogg to jump out after him and travel through time. Now Bogg is stuck in time with a 12 year old kid (Jeffery), no guide book, and no way of getting Jeffery back. But he does have an ace in the hole. Jeffery's dad was a history professor and Jeffery picked up much of his knowledge. So now the two of them, travel through time, giving history a push along where it is needed

The show was called "Voyagers" and it only ran for 20 episodes due to the death of it's lead actor Jon-Erik Hexum who accidently shot himself with a blank pistol on the set of the show. It also stared Meeno Peluce who is the brother of actress Solei-Moon Fry of Punky Brewster fame. It was a really cool show.

Bill & Ted's Excellent Adventure?

Here is the synopsis from Wikipedia:

Bill & Ted's Excellent Adventure (1989) is a comedy/science fiction movie in which two slackers travel through time in order to assemble a menagerie of historical figures for their high school history presentation.

The movie was released by Nelson Entertainment and Orion Pictures. It stars Alex Winter as Bill S. Preston Esq., Keanu Reeves as Ted "Theodore" Logan, and George Carlin as the mystical Rufus.

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I stand corrected (by the person below me).. he's right!

http://us.imdb.com/title/tt0083500/ You've got my vote!

Cambria...he said EARLY 80's.....dear lord.....

I believe it was called Voyagers....