[CrashPQ]

The main character in the Carousel of Progress is not the same man aging, he a likeness of the man in the previous setting. He may even be the same man appearing as he would in a given era. As the main character and narrator it's best to maintain a sense of familiarity throughout the show. I suspect, that initially, he would have been the same person, except that concept had to be changed with each change of the final scene. When it first appeared, the lapse between scenes was surely consistant, but in keeping with the past to present theme, the last scene needs to be current.