This Saguaro Cactus, which is the state flower of Arizona, is approximately 410 years old. Most of these cacti only live to be around 150 to 200 years old. They get their first arm when they are 75 years old. I thought it was interesting that these cacti only grow in Arizona and a small part of southern California. Needless to say, the volunteers at North Ranch, take very good care of this plant.