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Morgoth's ring and the laws and customs of the Eldar therein has the info you require.
Basically an elf takes at leat 50 and up to 100 years to be fully grown.
At first they develop quicker than mortals, able to walk talk and dance by the end of their first year but then linger in the "first spring of childhood". Roughly speaking it work out that an human child will have the physical development of an elf child two and a half times older.
They need little teaching or governance and I will look up the rest if someone doesn't beat me to it!!!
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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