Though the average specimen in captivity might live 25 or 35 years, an old koi named Hanako, from Mino province in Japan, has been shown to be over 215 years old based on analysis of her scales, and other 100+ year old fish are known from the same pond. Koi, like wild carp, can grow to 36 or more under perfect conditions.
The gold and silver medals weigh 412 grams (0.9 pounds) and the bronze medal weighs 357 grams (0.78 pounds). They are the biggest and heaviest summer Olympic medals ever made.
Friday, May 4, 2007. The Royal Canadian Mint (RCM) introduced two new products Thursday, one of which is claimed to be the world's largest gold coin. The Gold Maple Leaf coin, made of 99.999% pure gold, weighs 100 kg and has a face value of CA$1 million. The other offering is a smaller one ounce (28 g) version.