Your pointing that the education policies are not developed because pledges for the elderly are dominated is impressive. Definitely, the new policy appropriate to an aging society is needed.

 Although I agree with lowering the voting age, It is hard for me to support certainly your fourth basis. The argument that agrees with lowering the voting age to balance the liberals and conservatives, can lead to the view that sees the voters as means for the benefit of parties. The voters have the right to vote not for the benefit of the liberals and conservatives, but because they are sovereigns.

 Anyway, your basis is reliable, and I agree with your most of arguments!