Hem.... Just crawling out of my lurking to point you all that there is already numurous walkthrough of this game on Youtube. So you can all check it by yourself.
Ex:
https://www.youtube.com/watch?v=vx2TkNZadi8 (part 1)
Anyway, from what i saw. The character seem to shift from 4 ages state back and forth through all the game. Unfortunatly, all of them are done off screen. (Except maybe 1 time at the end where it done on screen but in a blinding flash)
So yeaaaahhh, no process at all to be seen here. Bit disapointing.
Beside, the character's shape and curve doesn't change and aren't shown that much either. And with cloth that also change every stage, it's really hard to assimilate that to an "age progressing". More like "Here you go, play a different character!"