How old are they?

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Andrew Carden

Barry Williams was 20 when the show ended in 1974, so that would make him 47 today.

Barry Williams (Greg) is 46, Christopher Knight (Peter) is 43, Maureen McCormick (Marcia) I believe is 45, Eve Plumb (Jan) is 43, Mike Lookingland (Bobby) is 40, and Susan Olsen (Cindy) is 40

While I'm at it, I thought I'd mention the following:

Florence Henderson is 67
Ann B. Davis is 75
Allan Melvin (Sam) is 79