The teachings of the Watchtower Bible and Tract Society (Jehovah’s Witnesses) often have an expiration period.
They don’t announce it in advance they mostly phased out “truth” and phase in “new truth.” When questioned about the change they claim that the “new truth” is “new light” from Jehovah.
We can often tell how long someone has been a Jehovah’s Witness based on what they belief.
On more than one occasion we have had to explain to a JW that what they as individuals believe is “Old Light” and was changed in the near past.
The result is, the current Watchtower Organization is not your parents’ Watchtower Organization