There’s a reason most powerful wizards are old. The special formulas of action, item, and sound that produce wizardly magic require precision, and such precision comes only from long practice. More than that, each spell a wizard might cast requires a portion of one’s powerful intellect to be dedicated to the task, with the necessary patterns of thought and proper mindset kept in stasis, ready to be unleashed. Even after these concepts are mastered, new knowledge of magic remains elusive, and a wizard must progress steadily through deeper levels of understanding, breaking through mental barriers in order to achieve ever greater mastery.
Of all peoples, elves are perhaps best suited to wizardry. They have centuries of life to devote to their studies, and their trance effectively gives them extra time to practice, as lessons learned during study can be reinforced by recalling them during resting periods. The rigidity and studiousness required by wizardry would seem anathema to a people who can recall a life of unfettered exploration and free expression of form, but magic provides a means of regaining that power. The patience and restraint for which elves are well known serves them well in this pursuit.
Not all elven communities embrace wizardry, but most worlds of the multiverse have at least one community of elves in which the spellcasters are renowned as masters. In some worlds, elves are even credited with the invention of the art of wizardry.