asteroider, do you really believe that your post belongs in the economics forum?
To project population disbursements is essential to forward planning.
However perhaps a government based annuity program might be appropriate in certain circumstances.
That is whereby those who find they don't have enough in their Super Fund can give their balance to the government Annuity Board and receive a fixed income after that.
So say the base pension rate is the dole. If you have no assets (as regulated. But have you ever heard of a male loosing all his assets through divorce?) you receive the full pension.
If you have super up to perhaps $300k and your assets are nominal you receive a top up to get the full pension. If you have between $300-$500 then you have the option of the base dole rate plus an annuity that takes you over the maximum pension rate.
Over that you're on your own.
It just might take something as pliable as this to reach an equitable solution.
There are so many options out here. Picking the figure 70 and going on a rage won't help one bit.