Before I was 25, I was standing watch as officer of the deck on a US Navy nuclear powered ballistic missile submarine. For six hours each and every night, I was entrusted with the proper operation and safety of a multibillion dollar warship, a 78 megawatt nuclear reactor, 16 ICBMs and 120 sailors, who could all die if I screwed up badly enough. During that time, I was answerable only to the captain (who was usually asleep since it was the middle of the night).
It's really amazing how much young adults can do if you just expect it of them and don't tolerate excuses.