Oddee has a great article featuring the World's Youngest record holders for a variety of titles. While they range from shocking (the world's youngest grandmother) to fascinating (the world's youngest CEO). Perhaps the cutest though is the world's youngest surfer:
Jaylan Amor is only two years old, but is already surfing the waves outside of Brisbane, Australia, and has secured multiple endorsements from surf shops. To catch a wave, his dad paddles him out to sea, then the two year old hops and rides the waves back into shore. Mr Amor isn't worried if Jaylan falls, as the tike just swims back to his board and waits for daddy to help him back up.
Read about the rest at the link.