Arwen vs. Galadriel

[Orphalesion]

Originally Posted by Ivriniel

I don't see indication of 200 year maturations being viable in this setting, in a generational legacy of Elven births. For example, Gondolin is constructed in 54, Aredhel leaves Gondolin at year 104, presumably not as a child. (anyone dispute this?)

Yes I dispute this; Aredhel was born in Valinor, long before Gondolin was founded and was a fully grown woman by the time of Feanor's rebellion.

Aside from that yes, it seems Elves did not mature that much slower than men in the chronologies (though 50 years still seems feasible). But then, the essay stuff Tolkien wrote often did not mesh with the actual stories.
I think he tried to give the Elves a slower maturation rate to explain why there were only four generations by the time of Feanor's rebellion and not six or seven or more.