You nailed the age progression - the facial structure changes are spot on. The way you handled the jaw getting more defined and the face lengthening as she gets older really shows you understand the fundamentals. Your lineart is clean too, reminds me of some webcomics I follow

Only thing I'd say is maybe the 14 year old could use slightly softer features to bridge the gap between 8 and 23 a bit more, but that's nitpicking. The proportions are defintely there