As you have seen by answering such a post: Yes

- and this would be possible without any problems.
Please don´t forget, that Civ 7 in these mechanics is only the updated C3C campaign, created by Ed Beach decades ago, and these "age transitions" are only the putty to glue several otherwise independent scenarios together (in the C3C campaign 9 scenarios and not only those lousy 3 as in Civ 7 yet).
The putty in the C3C campaign was a score system by points for each single scenario and these scores were added together for the final result of the campaign. This is the same mechanism yet, but updated to the current age transitions in Civ 7. The age transitions should help, that now more civers should play Civ 7 to the end of the game and (not so frequently posted), still glue parts of the game together, that otherwise would not fit together. When looking at many posts here at CFC, the current mechanics of "age transitions" failed in convincing many players of Civ 7 to play the game up to the end. Those players seem now even to stop at the end of era 1 and even worse - don´t are motivated to play Civ 7 again, at least not in a longer time.
The crazy truth is, that these "age transition" parts of the game in reality are not needed at all, when the "civ switching" is set to a more smooth evolution of the civs (civ defined as the history of the population at a certain place on earth) and not to such comical settings to transform per example Rome into Mexico. If you don´t believe this, please play the C3C mod CCM 3 in combination with the C3X mod and you can see that this is the truth (of course in that mod there is always place for improving it).