Giant Saguaro, Rio Verde, AZ These Saguaro's are protected in Arizona. The cactus grows "arms" when they are 60-75 years old. Grows one on one side, then another arm grows on opposite side... to balance the cactus.
These cacti live to well over 100 years old. The cactus "skin" opens and contracts like an accordian.... dependent on amount of water it is receiving.