"Ahu" are stone platforms on which many moai sit. There are 313 known ahu and 125 of these carry moai. The biggest, Ahu Tongariki is 220 m (720 ft), and had the most (15) and tallest moai.
With age, you see people fail more. You see yourself fail more. How do you keep that fearlessness of a kid? You keep going. Luckily, I'm not afraid to make a fool of myself.