The cactus was likely 150 years old ... The growth rate of saguaros is learned through long-term study at places like Tumamoc Hill, where over 6,000 saguaros have been studied, measured and monitored ...

Since cacti can live for a long time, it’s definitely a worthwhile DIY gardening project and an investment. If you know how to care for cactus, you'll know that they require specific conditions ...