It's believed that giant squid live about five years and, in that time, reproduce only once.

How long do colossal squids live for?

Age and Lifespan

It's estimated that colossal squid live to be around two years old. It's possible that they grow from a few millimetres long to over 10 metres, in just two years! Scientists don't know how old the most recent colossal squid specimen is.

Will a giant squid eat a human?

The story has been called the only substantiated report of a giant squid killing humans. ... In 2003, the crew of a yacht competing to win the round-the-world Jules Verne Trophy reported being attacked by a giant squid several hours after departing from Brittany, France.