Above suggestions are all good.
You have a bunch of things all affecting income:
Pensions
RRSP/RRIf and when to withdraw
CPP
OAS
As RCS said, there are lots of online sources for RRIF minimum withdrawal rates. The % each year is based on the RRIF's value at the beginning of the year, so if it is doing well, it will make more than you withdraw if you are taking out the minimum. Eventually it will make less as you have to withdraw a larger %, and the total will start going down. The %'s are huge by 90 (not that there will be much left by then), so if you expect to live longer, you want to get it out and into other investments for when you are 98. If you don't need the income, you can put it in a TFSA or other investments until you do need it. The older spouse can also use the % of the younger spouse, which means a smaller % withdrawal.
OAS -starts at 65, no benefit to delaying that I am aware of - anyone know more about it?
CPP - of course the government has put in incentives to encourage you to delay taking it, but the payout to your estate (if you should die early) is tiny, so worth taking it out and, again, investing what you don't need.
My bank's financial planner pointed out that most people delay their RRIF until 71, when it is a fairly big %, and since they are already getting OAS they have a big jump in income and get hit with taxes. Better to take as much income from various sources as you can before 71, invest what is not needed (if you can leave it until 71, you didn't need it, right?) and plan for as much as possible to be tax-sheltered.
Hope this helped a bit.