Everyone dies. But delaying that impending sentence is the holy grail. Science, scorcery, and wishful thinking do all in their power to bestow such delays. Be your deeds pure or evil, cheating death is neither easy nor reliable.
Wanderers beware, these gates open not,
Except to those only who the way have bought.
You may purchase the right to pass me by,
By each guessing my riddles. Care to try?
Elves are not actually aloof. They are actually extremely family-based and insular, and often intermarry inside their families, making them uncomfortable around those not of their family. Therefore, they shield themselves behind pretended aloofness and coldness until they are comfortable in others' company.