The last data i saw was a projection of china'sp ion which essentially showed i contracting by almost 50 %, by 21 hundred so in the so i that's a really, really bad situation. When you have lots of lots of young people, you can unramp them into economically productive activities like manufacturing. The problem in those folks accumulate middle class income and wealth is that they age out of those kinds of jobs,. And what we seek are services and service level jobs. So as populations age, your economy has to turn over - unless you have a large bulwark of young people that constantly growing to take up more of the slack.