I love that show, I watch it each morning while I do my weights. Kent McCord makes a great distraction! He was a friend of Ricky Nelson's and if you watch some of the Ozzie and Harriet episodes from around '62-'63 you'll see him in certain episodes which centered around Rick's fraternity. Here he is a year before Adam-12, getting a lecture from Joe Friday.
He definitely aged well, like a fine wine. I thought he was hot in (God forgive me) Galactica 1980, but he was still a DILF (or even a GILF) as the father of the main character in Farscape, 3 or so decades after Adam 12.