Solving the "elf superiority problem"

[PhoenixPhyre]

5e description of elves says "Although elves reach physical maturity at about the same age as humans, the elven understanding of adulthood goes beyond physical growth to encompass worldly experience. An elf typically claims adulthood and an adult name around the age of 100 and can live to be 750 years old."
Which is much more reasonable from a biological point of view.

Yeah. Adulthood as social status, not physical maturity.

Which is (to a much smaller degree) what we do with adolescent humans. They're physically mature much earlier than they're considered fully adult. I mean... Try renting a car at age 18 in the US.