You can open a Registered Retirement Income Fund (RRIF) anytime, but no later than the end of the year you turn 71. You must take out a minimum amount from your RRIF each year. This amount increases as you get older. There is no maximum withdrawal limit. Here is more information about how RRIFs work and making withdrawals from your RRIF.
Speak to your financial advisor to find out the best options for you.