Let me remind you that this age gap is not that big. If the girls were 40 and 20 you would have no problem would you? Even though the age gap is so much bigger.
This age gap is pretty big. An age gap is much less significant among adults than among children, something that Jess acknowledged, but you seem to have ignored:
I am looking fwd to a time skip! Since this age difference isnt that big of a deal once you are over 20.
The difference in maturity between someone around 12 years old and someone around 16 is bigger than the one between a 20 and a 24 year old. Or than the one between a 20 and a 40 year old.