Just make the retirement age enforced for elected officials too. If the average American is expected to retire at 67, shouldn't our representatives be younger than that?
I mean they can try but I think most politicians / parties would consider such a move political suicide regardless if they manage to ram it through or not. In some countries retirement is a pretty vague thing altogether though so the quick and easy fix is to just quit voting the people you consider too old into congress.
Can only vote on the people on the ballot.. the important choices was already made for you.
Edit: do not know how it is is us, but around here there are very few young people in national goverment, since they usualy have to work their way up the ranks in local politics. So vote in a young person in the local council, and try to speed run them to the senate (equivalent)
You've quoted the age for full Social Security benefits, not something that's enforced or even expected. Retirement's just an option for anyone who can afford to do so.