On Eberron, the age of an elf is subjective and can vary based on their race. For example, an Eladrin elf is born as an adult and ages very slowly, while a Drow elf ages more quickly but still lives longer than a human. In general, elves are considered to be long-lived and age gracefully, typically living for thousands of years. However, it's important to note that the concept of aging and age in Eberron is more of a philosophical and cultural discussion than a scientific one.