This cactus can take 75 years to grow its first arm

A saguaro grows only about an inch in its first decade, doesn't flower until around age 35, and typically doesn't sprout its first side arm until it's 50 to 75 years old. Given enough time — 150 to 200 years — a single plant can weigh several tons and store enough water after rain to survive over a year of drought.

— U.S. National Park Service species accounts, Carnegiea gigantea — Saguaro National Park species account