Such an estimate is given here for western Europe.  It shows that oldest population segment has a prevalence of infection approaching 100% while the youngest is virtually free of infection.

The reason is that the oldest generation was born at a time when the risk of infection was very large and, in addition, this birth cohort has lived for such a long time that their cumulative chance of having escaped infection is very small.

In contrast, the youngest generation was born into a calendar time when the risk of infection was very small and also they had lived for a shorter period of time.

If the negative slope (decline) in the risk of infection can be sustained, then each generation that dies will remove a large infection pool from the population and will be replaced by a generation with an increasingly lower risk of becoming infected.

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