does anyone remember in one epsiode Endora I believe says something to the effect of Samantha will never grow old yet Darrin would- I think int he episode where Darrin meets Endora for the first time. OK if Samantha never ages then how come Endora did and Aunt Clara and all the rest of the older witches? Or does it takes thousands of years or something? well it didn't appear that Endora meant Samantha would EVER grow old!
just wondering...

In "Eye of the Beholder", Endora says witches don't grow at the same pace as mortals. So while Darrin was 75, Sam would only look a little older. See this page:

http://www.harpiesbizarre.com/ageofwitches.htm

During the run of "Bewitched", Tabitha seems to age at a normal mortal rate. Yet Sam is supposed to be centuries old. So if it took Sam only 18 years to reach adulthood, and if Darrin was her first husband, wouldn't she have remained unmarried for several centuries???

to explain TABITHA- well maybe it's cause she is half human