Since 1963, a silver sake cup - or sakazuki - has been presented to everyone who reaches 100 years old. The cups, worth 8,000 yen ($65; £40) each, are a thank you for centenarians' contribution to society. But as Japan's elderly population has expanded, so too has the gift bill, Kyodo news agency reports . Last year, the government shelled out 260 million yen ($2.1m; £1.3m) on the items, a figure officials say isn't sustainable.