I was just listening to Gerry Beauchemin’s audio files of his book, Hope Beyond Hell, yesterday, and it was talking about this. That an age was determined by the subject to which it was applied. Sort of the adjective being modified by the noun. Thomas Talbott also talks about this.
Anyway, he made the point that an age can pertain to a life span, and in that sense an age for a tortoise would be very different from an age for a fruit fly (my example). An age for God would in fact be eternal while an age for His chastisement needn’t be – it would last for the duration of the chastisement (until the uttermost farthing is paid, for example). In this sense an age could also apply to the lifespan of a dispensation such as the Aaronic priesthood, whose lifespan endured until the inauguration of the Melchizedek priesthood.
I’m not sure we can delineate things out into neat and tidy ages or dispensations. Like all living things, ages are messy and vary with circumstances, and are perhaps impossible to pin down. But I am convinced and convicted that God’s dispensations, however complex and seemingly messy are nothing short of absolute perfection which in the end will fit together with such precision we will all marvel and give Him wondering praise for His love and mercy and His illimitable beauty and wisdom in working all things together for nothing less than our and His ultimate good.
Blessings, Cindy