I have seen so many people lament old people's choices, citing the fact that old people will die sooner. Yes, true. But what do you honestly think should be the solution? No democracy for you, sorry, you're over 65! Utterly disgusting, and I think if I was of such an age I'd find it pretty damn insulting.
And I suppose the terminally ill shouldn't vote either? Hey, you just got terminal cancer? Well, the vote won't affect you for very long, no democracy for you!