Retirement has historically lasted about two decades, but for some Canadians it is now extending to twice that amount of time as more live well into their 90s and beyond. That's making some rethink their investments, savings, expenses and when to retire as they look to stretch their retirement funds further than ever. Statistics Canada released new projections this week suggesting that the number of Canadians aged over 85 could more than triple by 2073, while the number of centenarians could almost increase by 10 times, surpassing 106,000.