Ken Berry 35
George Lindsey 40
Jack Dodson 37
Paul Hartman 64
Arlene Golonka 32
Buddy Foster 11
Frances Bavier 66
Alice Ghostley 47 (1970, when she joined)
Mary Lansing 57
Richard Steele 14
Charles Lampkin 55
Vince Barnett 66
Norman Leavitt 55
William Keene 53
Andy Griffith 42
Hope Summers 66
Maudie Prickett 55 (1969 appearances)
George Cisar 56
Don Knotts 44 (reference as guest star in last ep/pilot)
Aneta Corsaut 35 (reference as guest star in last ep/pilot)

Sorry Rusty. I thought Paul Hartman was older as I had looked up his age a couple of years ago. He was younger than I remember but still looked older. I think he was a dancer as well.

And he had his 50th birthday episode that year.

I had to stop for a minute to figure out that you meant to say the character Emmett turned 50. Anyway, he did look much older than 50.

And he had his 50th birthday episode that year.

He also made a comment in the final episode about inventing something in 1929 or 1932. The 50th birthday in 1968 would mean he was born in 1918, making him an inventor at around age 11 or 14.