I have heard that aidios is the only word for eternal and all others are only referring to age (an ending period of time). (Possible source link added)
In the Bible Aidios is used only twice in Romans 1:20 and Jude 1:6-7.
There are several other words, but I'm not familiar with them.
Can someone please give me an short overview of the various words for Eternal, age, and similar? I am primarily interested in the true words for "eternal" and not "age".