It's not just the economy. A large, old population needs care, which needs to be provided by younger people. It's a problem if these younger people do not exist

It's not just the economy. A large, old population needs care, which needs to be provided by younger people. It's a problem if these younger people do not exist. The population decreasing as a whole is probably good, but a population that has many old people and few young people will be struggling.