Life Span: Unknown, but hundreds if not thousands of years. Guinan was on Earth in 1893 and did not appear to be any younger then in the 24th century.
Warp capable: Yes
Environmental requirements: M class
Telepathic abilities: Limited empathic ability (believed)
Federation Status: Neutral
Encountered: In 2293, a group of El-Aurian refugees rescued by the USS Enterprise-B and Guinan came aboard the Enterprise-D in 2365. However, humans have encountered El-Aurians at least as far back as 1893 without knowing it.
Known members: Guinan, Martus Mazur, Dr. Tolian Soran
El-Aurians were a humanoid species of “listeners”. They are a highly personable and empathetic race. Some used this to help others, acting as advisers or confidants The El-Aurians were also extraordinarily sensitive to the space-time continuum.
The El-Aurians were a widely traveled people who spread themselves across many parts of the galaxy. It is known that at least one El-Aurian visited Earth in 1893, before Humans had any official knowledge of alien species. Around 2265, the Borg launched a major attack on this species, wiping out all but a handful. The survivors scattered throughout the galaxy, finding homes amongst many species.