TOKYO (Reuters) - Japan‘s Kin-san and Gin-san, the world‘s oldest living twins, celebrated their 106th birthdays on Saturday by saying life gets much better after 100. Kin Narita and Gin Kanie, the dynamic duo of centenarians, celebrated their birthdays at a party with 140 family members and friends in Nagoya, central Japan. They also received gifts and congratulations from across the country. Kin and Gin, which mean gold and silver, were born to a farming family in central Japan on August 1, 1892. The effervescent Kin told reporters in Nagoya that she is in much better shape now then she was when she turned 100. Kin, the older half of the duo, who likes to joke that she has had so many birthdays that she has to check city records to find out exactly how old she is. Younger sister Gin spent a few days in the hospital in May due a respiratory ailment but said she feels much better now. Kin has been the more active of the two and still takes daily walks around her neighbourhood. Fame did not come to the twins until they turned 99. They were „discovered“ by local politicians who visited them on Respect for the Aged Day, one of Japan‘s national holidays, and they were designated national treasures by the government in 1991. Kin and Gin have said the vault to fame brought them closer together and gave them renewed energy. They live in separate homes in Nagoya but they make numerous television and public appearances together. They recorded a „granny rap“ record that vaulted up the Japanese pop charts for their 100th birthdays. It also took them 100 years to file their first income tax returns because of the unexpected income from their pop music venture, endorsement contracts and guest television appearances. At the age of 19, Kin married farmer Ryokichi Narita, and at age 22, Gin married Sonojiro Kanie, also a farmer. They have numerous children, grandchildren and great-grandchildren.