The current RRIF rules do not allow you to start with an income that you can increase over time without that age of 71 causing you grief. If you keep it at the RRIF minimum, it increases at 71. Then the income starts going down because you keep taking a bigger percentage of a little pie. So that age 71 just doesn't allow for that level of income over time.
On October 21st, 2014. See this statement in context.