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.
Density of Gold & Other Metals. Density of Gold, Silver, Copper, Platinum & Other Jewellery Metals. Every week several people ask us questions about the weight or density of gold. A typical question is What does a cubic meter / foot / inch / centimetre of gold weigh?.