Elven Children

[Valier]

While I was reading Unfinished tales something caught my eye....

Turin to Sador-- "Was Lalaith indeed like an elf-child, as my father said? And what did he mean when he said that she was briefer?" "Very like' said Sador. "For in their first youth the children of Men and Elves seem close akin. But the children of Men grow more swiftly, and their youth passes soon, such is our fate."

I was wondering about Elf children....How long would it take to grow to adult stature? And what would they be like? would they have all the same teenage problems as Men do? What would the Elf-children learn and do each day? I can find little more info on Elven children and want to know if anyone else knew more.