quick clarification about elf maturity.

my understanding has always been that, in elven culture, elves aren't considered "mentally mature" by other elves until around the age of 100.

that makes sense to me. elves are aloof and sheltered and it tracks that a creature with 700+ years ahead of it would think 100 is immature.

but that's not to say a 20 year old elf would be considered a baby to basically any other species, right ?

elves still physically mature at the same rate as humans. it's only snobby fellow elves that consider them children before their first century.

i ask because i had a friend suggest that a 20 year old elf and a 20 year old human dating would be wrong because the elf would be too immature. i just don't think that's the intention of the lore.

am i right ? does the lore contradict this at all ?