Well, most governments have had 'pro-family' politics that are against teen pregnancy; but in favour of getting married and raising children. So they don't wan

Well, most governments have had 'pro-family' politics that are against teen pregnancy; but in favour of getting married and raising children. So they don't want to lower the sex-vs-age chart for all ages, they want to add a step function to it, so it's zero at age 19 but high at age 23. Lowering the chart for all ages was never the goal, which might be why we've never seen politicians celebrating the current state as the successful delivery of their election promises.