For the first time there’s more people worldwide aged 65+ than aged 5 & younger

The impact on the world’s economy will be staggering, especially since there are effectively no known cases where long-term economic growth takes place against the backdrop of a shrinking population. Individual countries might prosper if they can lure more people to move within their borders, but the whole planet may start to resemble Japan, which is 30 years into its “lost decade” of weak economic growth and population decline. That means things will get weird:
To get a sense of what happens when a country ages dramatically and doesn’t replenish its population with younger residents, look to ultra-restrictionist Japan, which is the prime example of a First World “demographic disaster.”

Source: reason.com