Well, I'm not a JW, I'm a born again Christian who studies Hebrew and Greek. Secondly, forever and ever is an English translation of ages of the ages. The Bible was written in Hebrew and Greek, not English.
You sound a whole lot like SDA though. You got this doctrine from somewhere.
The doctrine has to ignore concepts, Ignore other Accepted Greek Scholars and I gave 3 respected references.
Has to ignore Abraham giving a descripture of a very hot place. Some say... "Well that is just a Parable.........."
It was no Parable, but an actual account.
Have to make Aionios not eternal in just the places they choose. When it is just a Greek Adjective that continues on forever unless defined in the article like all Greek Adjectives.
SDA is the only other I can think of that get confused about these things. There are some other forms of it, but these are normally small groups.
We may not have Exact Hebrew and Greek to explain spiritual things but we do have the concept in the Article.
You don't take natural language make it dogmatic, and expect to not miss concepts of things human language needs many words to explain.
One reason Christ was not translated.
Abraham's seed has a everlasting covenant. That covenant is forever though the Hebrew Word does not exactly mean that. Even today we are the seed of Abraham.
There are things by concept and spiritual that are true, despite the proper and exact word being available.
Salvation in Greek has nothing to do with eternal life or anything spiritual. It means to be healed and protected. Physically.
It was though the only Word best to describe a new spiritual concept. It can mean both.
Saved is the same thing........ Means to be healed of something physical.
If we use the same rule of understanding, then there is whole lots of healing to believe for and very little Eternal life........ well not even eternal life is Aionios is not eternal, but has a end age (Which it don't)
Staying concistant with this dogmatic understanding of language is not good. The concept of the spiritual is what is important.
False doctrines do not stay consistant in understanding though. It's a hallmark of false doctrine. We would also have to understand Salvation, saved, Christ as their actualy non spiritual understanding if we were to do that with one word, it must apply to all.