Not really forced, but nudged towards. The trivial approach would be something like significantly higher taxes and social contributions for each subsequent adul

Not really forced, but nudged towards. The trivial approach would be something like significantly higher taxes and social contributions for each subsequent adult year of childlessness. Wouldn't be unwarranted since you're a greater burden overall to society over your lifetime and you're not contributing to the next generation. Countries could then use that money to either subsidize other people having kids (optimistic solution) or compete on attracting young people from other countries (more realistic solution). People seem to think "oh, I'm paying my social contributions, that should be enough for my retirement", but the whole formula really doesn't factor in a sharp drop in workforce we're about to experience. We're papering over the monetary deficit with credit all over the world, but that's not feasible long-term, and the "who's actually gonna do it" aspect will become much more important. Writing a check doesn't change the senior's diaper, nor anything else. As for practical solutions, first you have to make it possible for young people to obtain real estate again somehow (crucial), then to subsidize kindergartens / child care of all kinds heavily, and only then go more radical. Another radical angle could be some sort of education reform where people are somehow incentivized to do all the post-BSc education in their 30s instead of 20s. How to achieve that without horrible side effects is up to debate. Subsidies for parents on every corner and every aspect of life (including education) would probably work, but how much is the optimum and how to implement it is a serious question.