What should the voting age be?

[Tellos Athenaios]

I'm not objecting to voting in self interest per se, but to voting selfishly--i.e. in your own self interest while spiting others.

And how is any voting age threshold going to change that? Specifically what makes you think the 50 somethings clinging on to an 80's sense of self-entitlement are going to become altruistic, well meaning citizens in touch with the need and tribulations of their society? How are they any better or more entitled to the vote than spoiled 20 year olds?

Or to put it bluntly: why further emphasise the power of those who led us into the current mess in the first place at the cost of those who will need to find a way out in 30 years time?