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.
But the design, and weight, of the medals varies from Games to Games. For example, the 2012 London medals were particularly large, clocking in at about 400 grams a piece. Money Magazine did the math on those and placed the intrinsic value for the first-place necklaces at $501 dollars. But of course, the medals are worth more than scrap metal. A few years ago, USA Today spoke with RR Auction in Boston, a firm that regularly sells Olympic medals. They estimated that an average summer goldâone not tied to a famous athlete or a historic Olympic momentâgoes for about $10,000.