Okay, so this is what I've found out with my 'obsession' with the Addams family of the like of Wednesday and Pugsley since their ages are very different in different versions:
..::The Addams Family 1964 - 1966::..
This is first series with two young children. Wednesday - Lisa Loring 6 - 8 years old Pugsley - Kenneth Weatherwax 9 - 10 years old
..::Halloween With The New Addams Family 1977::..
Somehow Gomez and Morticia apparently have produced two madami children that look exactly like their last named Wednesday and Pugsley aswell! They also wear the same thing! Wednesday - Lisa Loring 19 years old Pugsley...
Though Uncle Fester is a regular on the TV series, Charles Addams' prototype for Fester in the New Yorker cartoons was almost exclusively solitary, never shown indoors with the other family (except once as a painted portrait), and only once outdoors with the children (going fishing with dynamite).
With the start of the TV series, The New Yorker magazine stopped running any Addams-Family-themed cartoons from Charles Addams until just prior to his death in 1988, although a few familiar characters were allowed solitary appearances (the prototypes for Pugsley, Cousin...