Here's some fun facts about these cacti. They don't grow their first arm until they are about 50 to 70 years old, however, in areas with little rain it can take up to 100 years. They are considered to be adult plants at 125 years of age, and at this point may weigh 6 tons and be 50 feet tall. The average life span is 150 to 175 years although some live to be around 200. They only grow in the sonoran desert and even then, only in elevation between sea level and 4,000 feet. It is actually illegal to uproot a saguaro cactus and when removal is needed due to house building or something similar, a permit must be obtained. I feel very fortunate to live in a place where these wise cacti grow. Very few people have the opportunity to greet these ancient beings.