Richard, I would suggest that we look at the two words; ages (aionos), and dispensation (oikonomia) as not being descriptive of the same thing.
Originally Posted by RAM
An eon, or age (aionos) seems to be referring as a phase of time.
Whereas, a dispensation (oikonomia) seems to refer to a duty or responsibility within a period of time such as a "stewardship".
In other words, dispensations occur within the eons.
Also, there are things which have occurred "before" the eons.
There are things that have occurred, and will occur during the eons.
And, it appears that the current eons will terminate, followed by undescribed events that God has chosen not yet to reveal to us.
For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come, Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord. Romans 8:38,39