5 , Incredible Facts , About Elephants.br In honor of World Elephant Day, br here are five incredible facts you might br not have known about elephants. .br 1. , The tusks of an elephant continue to grow br throughout the elephant’s entire life, with adult br males' tusks growing about seven inches a year.br 2. , The average lifespan of an elephant is 50 to 70 years, with br the oldest elephant in the world reaching the age of 86.br 3. , An elephant’s trunk is its most important limb, br as it is strong enough to rip branches from a tree, br yet sensitive enough to pick up a blade of grass.br 4. , Female elephants have a structured social order br and spend their entire lives with their mothers, grandmothers, aunts, sisters and daughters.br 5.