Japan's population pyramid — a wide base and a narrow peak in 1950, a narrowed base and a swollen upper tier by 2026, when the share of residents aged 65 and older reached 29.6 percent — sets up the question the lecture opens with: if the object being governed, the structure of society itself, changes this radically while the instrument society uses to govern itself stays the same, whose decision, exactly, is it that the instrument stays the same? The lecture deliberately steers away from the frame of whether older people should be allowed to vote, and instead treats democracy the way this course has already proposed treating institutions in general: not as an ideology, but as a working engineering system with a century of empirical running history behind it.

The demographic shift is presented not as a hypothesis about generational sentiment but as a measured fact. Economists Vincenzo Galasso and Paola Profeta project a 6-to-13-year rise in the median voter's age by mid-century across six major democracies; data from the Swiss think tank Avenir Suisse show a 16-year gap between the median age of the population and the median age of those who actually vote, and outcomes diverging between young and old voters in more than a quarter of Swiss national referendums over 40 years. The lecture is methodologically careful to list competing explanations for low youth turnout without picking one, and arrives at the formula the rest of the lecture is built on: the demographic environment of democracy has changed faster than democracy's own architecture.

The central section examines three historical attempts to solve the problem of representing a complex society through a dedicated intermediary institution — the Irish Senate, the French Conseil économique, social et environnemental, and the Weimar Republic's Imperial Economic Council — showing that all three failed by three different mechanisms while their formal shell remained fully intact. Robert Michels's century-old iron law of oligarchy explains why this pattern reproduces so reliably, and Hannah Pitkin's four distinguishable senses of representation — formalistic, descriptive, symbolic, and substantive — supply the precise language for the diagnosis: the same architecture of hollowed-out form this course examined in Lecture 15 under the name of fictitious democracy, only one step earlier in the chain, at the intermediary itself.

The closing blocks carry the series' verifiability apparatus, built since Lecture 3, over to the problem of functional representation — the Kiewiet and McCubbins distinction between "police patrol" and "fire alarm" oversight, and Philippe Schmitter's boundary between societal and state corporatism — while honestly flagging a separate risk, illustrated by Hungary's near-adoption of Demeny voting, that the category of representation itself can be engineered to distort the balance it's meant to correct. The lecture does not resolve David Estlund's epistocracy objection — who defines the boundary of a constituency in a way acceptable to all reasonable parties — with an artificial conclusion, and closes on the open question of an institution empowered to create institutions, which the next lecture in the series takes up.