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.
There is no 'standard' bar of gold. Bars come in a range of weights, starting from 1 gram to 1000 grams generally. I have handled the following bars: 1 gram, 2 grams, 5 grams, 10 grams, 11.664 grams (1 tola). 20 grams, 31.1 grams (1 Oz.), 50 grams, 58.32 grams (5 tolas), 100 grams, 311 grams (10 Oz.), 500 grams and 1 kg.